CSS

Question

我想使用 css 为盒子创建一个特定的轮廓。

类似于这张图片：

拜托，有什么帮助吗？ :(

Answer 1

只是为了证明你的问题很简单。 ::before 和 ::after 隐藏部分边框。 z-index 用于叠加。

.dirt {
  position: relative;
  width: 200px;
  height: 100px;
  line-height: 100px;
  text-align: center;
  background-color: rgba(251, 145, 156, 1);
  border: 2px solid rgba(231, 0, 0, 1);
  box-sizing: border-box;
}
.dirt > span {
  position: relative;
  z-index: 15;
  background-color: rgba(255,255,255,0.5);
  padding: 25px;
}
.dirt::after,
.dirt::before {
  content: '';
  position: absolute;
  background-color: rgba(251, 145, 156, 1);
  /*same color*/
}
.dirt::before {
  top: 20%;
  bottom: 20%;
  left: -2px;
  /*border-width*/
  right: -2px;
  /*border-width*/
}
.dirt::after {
  top: -2px;
  /*border-width*/
  bottom: -2px;
  /*border-width*/
  left: 20%;
  right: 20%;
}

<p>An example: (do not use)</p>
<div class="dirt">
  <span>My little dirt text</span>
</div>

Answer 2

您可以查看渐变、背景剪辑和背景大小：

可能的例子http://codepen.io/gc-nomade/pen/aZbrEQ

div {
  margin: 1em auto;
  width: 600px;
  max-width: 70%;
  padding: 40px;
  /* set offset here for border corners */
  background: linear-gradient(white, white) top left no-repeat, linear-gradient(white, white) top left no-repeat, linear-gradient(white, white) top right no-repeat, linear-gradient(white, white) top right no-repeat, linear-gradient(white, white) bottom left no-repeat, linear-gradient(white, white) bottom left no-repeat, linear-gradient(white, white) bottom right no-repeat, linear-gradient(white, white) bottom right no-repeat, rgba(255, 255, 255, 0.15);
  /* color receive 
  background-clip:content-box; 
  so it is not drawn on padding areas */
  background-clip: border-box, border-box, border-box, border-box, border-box, border-box, border-box, border-box, content-box;
  background-size: 2px 60px, 80px 2px;
  /* here give length and thickness of border corners */
  color: white;
}
p,
h2 {
  padding: 1em;
  margin:0;
}
html {
  height: 100%;
  background: url(http://lorempixel.com/640/480/nature/6);
  background-size: cover
}
body {
  min-height: 100%;
  background: rgba(0, 0, 0, 0.5);
  margin: 0;
  padding: 4em;
}

<div>
  <h2>title</h2>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est.
    Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus
    lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. Praesent dapibus, neque id cursus faucibus, tortor neque egestas augue, eu vulputate magna eros eu erat. Aliquam erat volutpat. Nam dui mi, tincidunt quis, accumsan porttitor,
    facilisis luctus, metus</p>
</div>

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