使用 border-image 在我的角落显示 4 个点 div

Question

我正在尝试使用 border-image 为我的边框设置渐变颜色。但是什么时候使用 border-image: linear-gradient(-180deg, #2D6BD0 0%, #83B8FF 100%);我的 DIV... 有人知道为什么这没有显示整个边框吗？

.slider {
  width: 90%;
  min-height: 15vw;
  background: white;
  position: relative;
  float: left;
  display: block;
  border-style: solid;
  border-width: 0.3vw;
  border-image: linear-gradient(-180deg, #2D6BD0 0%, #83B8FF 100%);
  margin-left: 5%;
  margin-bottom: 2.5%;
  margin-top: -27.5%;
  border-radius: 8px;
  box-shadow: 2px 2px 4px 0px #000000;
  z-index: 20;
}

.insideslider {
  width: 80%;
  margin-left: 2.5%;
  float: left;
  position: relative;
}

.slides {
  position: relative;
  float: left;
  display: inline;
  width: 30%;
  margin-left: 3%;
  margin-top: 3.5%;
}

#slide1 {
  margin-left: 1.5%;
}

#slide2 {}

#slide3 {} 

.leftarrow {
  margin-top: 5vw;
  width: 5%;
  float: left;
  position: relative;
  margin-left: 2.5%;
}

.rightarrow {
  margin-top: 5vw;
  width: 5%;
  float: left;
  position: relative;
  margin-left: 2.5%;
  transform: rotate(180deg);
}

<div class="slider">

  <img class="leftarrow" src="images/rewind.png" />

  <div class="insideslider">
    <img class="slides" id="slide1" src="images/aandrijvingen.png" />

    <img class="slides" id="slide2" src="images/electronicrepair.png" />

    <img class="slides" id="slide3" src="images/retrofit.png" />

  </div>

  <img class="rightarrow" src="images/rewind.png" />

</div>

Answer 1

您需要设置border-image-slice property for the border image to appear properly instead of just on 4 corners. Initial value for this property is 100% and as explained in ，当左+右（或）上+下偏移之和分别大于图像的宽度或高度时，只有角才会得到边框图像。

在下面的代码片段中，我将值设置为 1（无单位值假定为 1px）。当使用渐变时，图像的尺寸等于容器框的尺寸，因此为 border-image-slice 设置 1px 的值意味着左右（或顶部和底部）偏移的总和很少是超过图像的尺寸。

注： border-image will not respect border-radius property 只会显示为 rectangle/square。以下是 W3C 规范（上面链接）的摘录。

A box's backgrounds, but not its border-image, are clipped to the appropriate curve...

.slider {
  width: 90%;
  min-height: 15vw;
  background: white;
  position: relative;
  float: left;
  display: block;
  border-style: solid;
  border-width: 0.3vw;
  border-image: linear-gradient(-180deg, #2D6BD0 0%, red 100%);
  border-image-slice: 1;
  margin-left: 5%;
  margin-bottom: 2.5%;
 /* margin-top: -27.5%;*/
  border-radius: 8px;
  box-shadow: 2px 2px 4px 0px #000000;
  z-index: 20;
}

.insideslider {
  width: 80%;
  margin-left: 2.5%;
  float: left;
  position: relative;
}

.slides {
  position: relative;
  float: left;
  display: inline;
  width: 30%;
  margin-left: 3%;
  margin-top: 3.5%;
}

#slide1 {
  margin-left: 1.5%;
}

#slide2 {}

#slide3 {} 

.leftarrow {
  margin-top: 5vw;
  width: 5%;
  float: left;
  position: relative;
  margin-left: 2.5%;
}

.rightarrow {
  margin-top: 5vw;
  width: 5%;
  float: left;
  position: relative;
  margin-left: 2.5%;
  transform: rotate(180deg);
}

<div class="slider">

  <img class="leftarrow" src="images/rewind.png" />

  <div class="insideslider">
    <img class="slides" id="slide1" src="images/aandrijvingen.png" />

    <img class="slides" id="slide2" src="images/electronicrepair.png" />

    <img class="slides" id="slide3" src="images/retrofit.png" />

  </div>

  <img class="rightarrow" src="images/rewind.png" />

</div>

使用 border-image 在我的角落显示 4 个点 div

Use of border-image display 4 dots in corners of my div

html

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border-image