html - 如何正确地为我的三 Angular 形添加阴影和渐变？

Question

我想做如下设计:

我尝试使用 :after 和 :before 但它不起作用。这是我当前的代码:

.design {
  background: #ea053a;
  display: inline-block;
  height: 155px;
  margin-left: 33px;
  margin-right: 40px;
  position: relative;
  width: 228px;
}

.design:before {
  border-top: 43px solid #ea053a;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  margin-right: 40px;
  content: "";
  height: 0;
  left: 0;
  position: absolute;
  top: 55px;
  margin-top: 100px;
  width: 128px;
}

<div class="design"></div>

如何让它与原始设计保持一致并具有以下两个属性？:

box-shadow: 0 1px 10px 0 rgba(0, 0, 0, 0.2);
background-image: linear-gradient(to bottom, #ea053a, #d0021b);

Answer 1

这是一个带有倾斜变换和drop-shadow 过滤器的想法。你只需要一些额外的元素来正确地拥有渐变。诀窍是反转倾斜以保持渐变方向正确(如果我们处理纯色则不需要)

.box {
  width: 150px;
  height: 150px;
  position: relative;
  z-index:0;
  overflow: hidden;
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.8));
}

.box span {
  position: absolute;
  z-index:-1;
  top: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
}

.box span:first-of-type {
  left: 0;
  transform: skewY(35deg);
  transform-origin: top right;
}

.box span:last-of-type {
  right: 0;
  transform: skewY(-35deg);
  transform-origin: top left;
}

.box span::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, blue , red );
  transform-origin: inherit;
}

.box span:first-of-type::before {
  transform: skewY(-35deg);
}

.box span:last-of-type::before {
  transform: skewY(35deg);
}

p {
 margin:0;
 color:#fff;
 font-size:45px;
 line-height:100px;
 text-align:center;
}

<div class="box">
  <span></span><span></span>
  <p>29</p>
</div>

这是我们如何处理左或右渐变。在这种情况下，我们不需要额外的元素，因为倾斜不会影响方向:

.box {
  width: 150px;
  height: 150px;
  position: relative;
  z-index:0;
  overflow: hidden;
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.8));
}

.box:before,
.box:after{
  content:"";
  position: absolute;
  z-index:-1;
  top: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  background:linear-gradient(to right,blue,red);
  background-size:200% 100%;
}

.box:before{
  left: 0;
  transform: skewY(35deg);
  transform-origin: top right;
}

.box:after{
  right: 0;
  transform: skewY(-35deg);
  transform-origin: top left;
  background-position:right;
}

p {
 margin:0;
 color:#fff;
 font-size:45px;
 line-height:100px;
 text-align:center;
}

<div class="box">
  <p>29</p>
</div>

这里是任意梯度:

.box {
   --g:linear-gradient(45deg,blue,red 60%,yellow); /* gradient coloration*/

  width: 150px;
  height: 150px;
  margin:15px;
  display:inline-block;
  position: relative;
  z-index:0;
  overflow: hidden;
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.8));
}

.box span {
  position: absolute;
  z-index:-1;
  top: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
}

.box span:first-of-type {
  left: 0;
  transform: skewY(35deg);
  transform-origin: top right;
}

.box span:last-of-type {
  right: 0;
  transform: skewY(-35deg);
  transform-origin: top left;
}

.box span::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--g);
  background-size:200% 100%;
  transform-origin: inherit;
}

.box span:first-of-type::before {
  transform: skewY(-35deg);
}

.box span:last-of-type::before {
  transform: skewY(35deg);
  background-position:right;
}

p {
 margin:0;
 color:#fff;
 font-size:45px;
 line-height:100px;
 text-align:center;
}

<div class="box">
  <span></span><span></span>
  <p>29</p>
</div>

<div class="box" style="--g:linear-gradient(-62deg,blue,red 60%,yellow)">
  <span></span><span></span>
  <p>29</p>
</div>

由于每个元素占用 50% 的宽度，我们将背景设置为 200% 以将其大小作为主要容器，然后我们调整位置以创建一个背景的错觉。就好像每个元素都会显示一半的主要背景。

---

使用掩码的优化版本

.box {
  width: 150px;
  height: 150px;
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.8));
}
.box > div {
  height: 100%;
  background: linear-gradient(35deg, blue, red);
  -webkit-mask: 
    linear-gradient(#fff, #fff) top/100% 70%, 
    linear-gradient(to bottom right, #fff 49.5%, transparent 50%) bottom right/50% 30%, 
    linear-gradient(to bottom left,  #fff 49.5%, transparent 50%) bottom left /50% 30%;
  mask: 
    linear-gradient(#fff, #fff) top/100% 70%, 
    linear-gradient(to bottom right, #fff 49.5%, transparent 50%) bottom right/50% 30%, 
    linear-gradient(to bottom left,  #fff 49.5%, transparent 50%) bottom left /50% 30%;
  -webkit-mask-repeat: no-repeat;
          mask-repeat: no-repeat;
}
p {
  margin: 0;
  color: #fff;
  font-size: 45px;
  line-height: 100px;
  text-align: center;
}

<div class="box">
  <div>
    <p>29</p>
  </div>
</div>

或者剪辑路径

.box {
  width: 150px;
  height: 150px;
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.8));
}
.box > div {
  height: 100%;
  background: linear-gradient(35deg, blue, red);
  clip-path:polygon(0 0,100% 0,100% 70%,50% 100%,0 70%);
}
p {
  margin: 0;
  color: #fff;
  font-size: 45px;
  line-height: 100px;
  text-align: center;
}

<div class="box">
  <div>
    <p>29</p>
  </div>
</div>