3d按钮 + X按钮

效果如图：

代码1：

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.wrapper{
  width: 150px;
  height: 150px;
  margin: 60px auto;
  border-radius: 50%;
  background: #b25244;
  background: linear-gradient(#b25244, #5e1912);
  position: relative;
  cursor: pointer;
  padding: 20px;
  box-shadow: inset 0 2px 3px rgba(255, 255, 255, 0.13), 0 5px 8px rgba(0, 0, 0, 0.5), 0 10px 10px 4px rgba(0, 0, 0, 0.3);
}
.wrapper:after{
  content: "";
  position: absolute;
  left: -20px;
  right: -20px;
  top: -20px;
  bottom: -20px;
  z-index: -2;
  border-radius: inherit;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 1px 2px rgba(0, 0, 0, 0.3), 0 0 10px rgba(0, 0, 0, 0.15);
}
.wrapper:before{
  content: "";
  position: absolute;
  left: -10px;
  right: -10px;
  top: -10px;
  bottom: -10px;
  z-index: -1;
  border-radius: inherit;
  box-shadow: inset 0 10px 10px rgba(0, 0, 0, 0.13);
  -webkit-filter: blur(1px);
  filter: blur(1px);
}
.inner{
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(#8a2c20, #9e4235);
  display: block;
  box-shadow: 0 -2px 5px rgba(255, 255, 255, 0.05), 0 2px 5px rgba(255, 255, 255, 0.1);
}
.inner:after{
  position: absolute;
  width: 50px;
  height: 50px;
  background: white;
  background: linear-gradient(#eaeceb, #8d8d8d);
  left: 50%;
  top: 50%;
  content: "";
  border-radius: inherit;
  margin: -25px 0 0 -25px;
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.3);
}
.inner:before{
  position: absolute;
  content: "";
  width: 40px;
  height: 40px;
  left: 50%;
  top: 50%;
  border-radius: inherit;
  background: inherit;
  margin: -20px 0 0 -20px;
  z-index: 2;
  box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.3), 0 1px 2px white;
}
.inner span{
  display: block;
  width: 20px;
  height: 20px;
  background: #8f3327;
  position: absolute;
  left: 50%;
  margin-left: -10px;
  top: 25px;
  z-index: 3;
  position: relative;
}
.inner span:before{
  content: "";
  position: absolute;
  width: 6px;
  height: 25px;
  background: linear-gradient(#ffffff, #cbcbcd);
  border-radius: 10px;
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.3);
  left: 50%;
  margin-left: -3px;
}

代码2：

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.close{
  position: relative;
  display: inline-block;
  width: .25rem;
  height: .25rem;
  overflow: hidden;
  margin-right: .5rem;
}
.close.big{
  -webkit-transform: scale(3);
  -moz-transform: scale(3);
  -ms-transform: scale(3);
  -o-transform: scale(3);
  transform: scale(3);
}
.close::before {
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}
.close::after {
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
}
.close::before, .close::after {
  content: '';
  position: absolute;
  height: 1px;
  width: 100%;
  top: 50%;
  left: 0;
  margin-top: -1px;
  background: #FCFCFC;
}
【页面效果】, CSS实现的3D按钮 + X按钮