如何在形状上正确添加阴影和渐变？

Question

我想做以下设计:

我尝试过:after,:before但它不起作用.这是我目前的代码:

.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>

(小提琴)

我怎么能保持原始设计和以下两个属性？:

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

Answer 1

这是一个带有偏斜变换和drop-shadow滤波器的想法.您只需要一些额外的元素来正确地获得渐变.诀窍是反转偏斜以保持梯度方向正确(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 );
}

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

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

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>

以下是我们如何使用左或右渐变.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>

这里有一个任意的渐变:

.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(35deg, blue , red );
  background-size:200% 100%;
}

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

.box span:last-of-type::before {
  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">
  <span></span><span></span>
  <p>29</p>
</div>

由于每个元素都占据50%了宽度,我们将背景设置200%为主要容器,然后我们调整位置以创建一个背景的错觉.这就像每个元素将显示主要背景的一半.