CSS 上的边框排列不正确

Question

body{
    margin: 0;
    padding: 0;
    background-color: #073146;
}

.box{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 350px;
    height: 180px;
    background-color: #001e2d;
    box-sizing: border-box;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 2px solid rgba(0, 0, 0, 0.5);
}

.box::before{
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: rgba(255,255,255,0.1);
    transition: 0.5s;
    pointer-events: none;
}

.box:hover:before{
    left: -50%;
    transform: skewX(-5deg);
}

/* this controls the text inside the box */
.box .content{   
   position: absolute;
   top: 15px;
   left: 15px;
   right: 15px;
   bottom: 15px;
   border: 2px solid #ffeb3b;
   padding: 30px;
   text-align: center;
   box-shadow: 0 15px 10px rgba(0, 0, 0, 0.5);
}

.box .content h1{
    color: white;
    font-size: 30px;
    margin: 0 0 10px;
    padding: 0;
}

.box .content p{
    color: white;
}

.box span{
    position: absolute;
    top: 0;
    left: 0;
    width: 149%;
    height: 100%;
    display: block;
    box-sizing: border-box;
}

.box span:nth-child(1){
    transform: rotate(0deg);
}

.box span:nth-child(2){
    transform: rotate(90deg);
}
.box span:nth-child(3){
    transform: rotate(180deg);
}

.box span:nth-child(4){
    transform: rotate(270deg);
}

/* setting up one line */
.box span:before{
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: #0093ff;
    animation: animate 4s linear infinite;
}

@keyframes animate {
    0%{
        transform: scaleX(0);
        transform-origin: left;
    }
    50%{
        transform: scaleX(1);
        transform-origin: left;
    }
     50.1%{
        transform: scaleX(1);
        transform-origin: right;
    }
    100%{
        transform: scaleX(0);
        transform-origin: right;
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="main.css">     
</head>
<body>
        <div class="box">
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            <div class="content">
                <h1>Some heaading</h1>
                <p>Three border is going perfect but the fourth border is messing up.</p>
            </div>
        </div>
</body>
</html>

我创建了这个 CSS，但是我的 CSS 的问题是我无法将所有四个边框都放在最后。我设法得到 3 个边框，但第四个边框似乎不合适。我想知道是否有人可以指导我如何在卡片末尾排列所有四个蓝色边框。有人可以指导或帮助获得适当的动画。我真的很感激这方面的帮助。

提前致谢

Answer 1

    .box span:nth-child(2){
    transform: rotate(90deg);
    right: -170px;
    left: auto;
}.box span:nth-child(2){
    transform: rotate(90deg);
    right: -170px;
    left: auto;
}
.box span:nth-child(3){
    transform: rotate(180deg);
}

.box span:nth-child(4){
    transform: rotate(270deg);
    left: -170px;
}

我不知道这是否正确或是否有任何其他合适的解决方案，但这对我有用。感谢评论员指导我正确的方向。我很感激

Answer 2

使用两种动画效果，因为宽高不一样，改变动画线的角度不在边上

body{
    margin: 0;
    padding: 0;
    background-color: #073146;
}

.box{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 350px;
    height: 180px;
    background-color: #001e2d;
    box-sizing: border-box;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 2px solid rgba(0, 0, 0, 0.5);
}

.box::before{
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: rgba(255,255,255,0.1);
    transition: 0.5s;
    pointer-events: none;
}

.box:hover:before{
    left: -50%;
    transform: skewX(-5deg);
}

/* this controls the text inside the box */
.box .content{   
   position: absolute;
   top: 15px;
   left: 15px;
   right: 15px;
   bottom: 15px;
   border: 2px solid #ffeb3b;
   padding: 30px;
   text-align: center;
   box-shadow: 0 15px 10px rgba(0, 0, 0, 0.5);
}

.box .content h1{
    color: white;
    font-size: 30px;
    margin: 0 0 10px;
    padding: 0;
}

.box .content p{
    color: white;
}

.box span{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    box-sizing: border-box;
}


.box span:nth-child(3){
    transform: rotate(180deg);
}

.box span:nth-child(4){
    transform: rotate(180deg);
}

/* setting up one line */
.box span:nth-child(odd):before{
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: #0093ff;
    animation: animate 4s linear infinite;
}

.box span:nth-child(even):before{
    content: '';
    position: absolute;
    height: 100%;
    width: 2px;
    background-color: #0093ff;
    animation: animate2 4s linear infinite;
}

@keyframes animate {
    0%{
        transform: scaleX(0);
        transform-origin: left;
    }
    50%{
        transform: scaleX(1);
        transform-origin: left;
    }
     50.1%{
        transform: scaleX(1);
        transform-origin: right;
    }
    100%{
        transform: scaleX(0);
        transform-origin: right;
    }
}

@keyframes animate2 {
    0%{
        transform: scaleY(0);
        transform-origin: bottom;
    }
    50%{
        transform: scaleY(1);
        transform-origin: bottom;
    }
     50.1%{
        transform: scaleY(1);
        transform-origin: top;
    }
    100%{
        transform: scaleY(0);
        transform-origin: top;
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="main.css">     
</head>
<body>
        <div class="box">
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            <div class="content">
                <h1>Some heaading</h1>
                <p>Three border is going perfect but the fourth border is messing up.</p>
            </div>
        </div>
</body>
</html>

Answer 3

您需要将 width: 属性设置为 .box span 下面的动画全宽，然后设置其第二个和第四个 nth-child 的 right: 和 left 属性。类似于：

body {
  margin: 0;
  padding: 0;
  background-color: #073146;
}

.box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 350px;
  height: 180px;
  background-color: #001e2d;
  box-sizing: border-box;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  border: 2px solid rgba(0, 0, 0, 0.5);
}

.box::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.1);
  transition: 0.5s;
  pointer-events: none;
}

.box:hover:before {
  left: -50%;
  transform: skewX(-5deg);
}

/* this controls the text inside the box */
.box .content {
  position: absolute;
  top: 15px;
  left: 15px;
  right: 15px;
  bottom: 15px;
  border: 2px solid #ffeb3b;
  padding: 30px;
  text-align: center;
  box-shadow: 0 15px 10px rgba(0, 0, 0, 0.5);
}

.box .content h1 {
  color: white;
  font-size: 30px;
  margin: 0 0 10px;
  padding: 0;
}

.box .content p {
  color: white;
}

.box span {
  position: absolute;
  top: 0;
  left: 0;
  width: 350px;
  height: 100%;
  display: block;
  box-sizing: border-box;
}

.box span:nth-child(1) {
  transform: rotate(0deg);
}

.box span:nth-child(2) {
  transform: rotate(90deg);
  right: -87px;
  left: auto;
}

.box span:nth-child(3) {
  transform: rotate(180deg);
}

.box span:nth-child(4) {
  transform: rotate(270deg);
  left: -87px;
  right: auto;
}

/* setting up one line */
.box span::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: #0093ff;
  animation: animate 4s linear infinite;
}

@keyframes animate {
  0% {
    transform: scaleX(0);
    transform-origin: left;
  }

  50% {
    transform: scaleX(1);
    transform-origin: left;
  }

  50.1% {
    transform: scaleX(1);
    transform-origin: right;
  }

  100% {
    transform: scaleX(0);
    transform-origin: right;
  }
}

<!DOCTYPE html>
<html lang="en">

  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="main.css">
  </head>

  <body>
    <div class="box">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <div class="content">
        <h1>Some heaading</h1>
        <p>Three border is going perfect but the fourth border is messing up.</p>
      </div>
    </div>
  </body>

</html>

Answer 4

这是一个简化版本，您只需要几行代码。整个动画可以使用背景来完成，不需要额外的元素：

body {
  margin: 0;
  background-color: #073146;
}

.box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 350px;
  background:
    linear-gradient(#0093ff 0 0) 0 0,
    linear-gradient(#0093ff 0 0) 100% 0,
    linear-gradient(#0093ff 0 0) 100% 100%,
    linear-gradient(#0093ff 0 0) 0 100%;
  background-size:100% 2px,2px 100%;
  background-repeat:no-repeat;
  background-color: #001e2d;
  box-sizing: border-box;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  border: 2px solid rgba(0, 0, 0, 0.5);
  overflow:hidden;
  animation:animate 2s linear infinite;
}

@keyframes animate{
   from {
      background-size:0% 2px,2px 0%;
      background-position:0 0,100% 0,100% 100%,0 100%;
   }
   50% {
      background-size:100% 2px,2px 100%;
      background-position:0 0,100% 0,100% 100%,0 100%;
   }
   50.1% {
      background-size:100% 2px,2px 100%;
      background-position:100% 0,100% 100%,0 100%,0 0;
   }
   100% {
      background-size:0% 2px,2px 0%;
      background-position:100% 0,100% 100%,0 100%,0 0;
   }
}

.box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.1);
  transition: 0.5s;
  pointer-events: none;
  transform-origin:top;
}

.box:hover:before {
  width:50%;
  transform: skewX(-5deg);
}

.box .content {
  margin:15px;
  border: 2px solid #ffeb3b;
  padding: 30px;
  text-align: center;
  color: white;
  box-shadow: 0 15px 10px rgba(0, 0, 0, 0.5);
}

.box .content h1 {
  font-size: 30px;
  margin: 0 0 10px;
}

<div class="box">
  <div class="content">
    <h1>Some heaading</h1>
    <p>Three border is going perfect but the fourth border is messing up.</p>
  </div>
</div>

类似效果的相关问题：

CSS 上的边框排列不正确

Border is not arranging properly on CSS

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