html - 如何添加 z-index 以将图像与 div 边框分开

Question

fiddle :https://jsfiddle.net/0qqnvrdg/

HTML:

<div class="loading"></div>

CSS:

    body {
  background: #0d8aa5;
}

.loading {
  position: absolute;
  left: 50%;
  top: 25%;
  /*margin: -60px 0 0 -60px;*/
  background: #fff;
  width: 200px;
  height: 200px;
  border-radius: 100%;
  border: 10px solid #19bee1;
}
.loading:after {
  content: '';
  background: trasparent;
  width: 140%;
  height: 140%;
  position: absolute;
  border-radius: 100%;
  top: -20%;
  left: -20%;
  opacity: 0.7;
  box-shadow: rgba(255, 255, 255, 0.6) -4px -5px 3px -3px;
  animation: rotate 2s infinite linear;
}

@keyframes rotate {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(360deg);
  }
}
.loading:before {
  background-image: url('http://i.stack.imgur.com/UTnLP.png');
    background-size: 100%;
  background-repeat: no-repeat;
    display: block;
    width: 85%; 
    height: 85%;
    content:"";
  position: absolute;
  top: 20%;
  left: 10%;
}

我如何修改 CSS，使图像位于白色细边框下方的同时位于细蓝色边框下方。

这可能吗？

Answer 1

添加了 z-index:-1000；下。

ps: scrollbar 效果不错)

body {
  background: #0d8aa5;
}
.loading {
  position: absolute;
  left: 50%;
  top: 25%;
  /*margin: -60px 0 0 -60px;*/
  background: transparent;
  width: 200px;
  height: 200px;
  border-radius: 100%;
  border: 10px solid #19bee1;
}
.loading:after {
  content: '';
  background: trasparent;
  width: 140%;
  height: 140%;
  position: absolute;
  border-radius: 100%;
  top: -20%;
  left: -20%;
  opacity: 0.7;
  box-shadow: rgba(255, 255, 255, 0.6) -4px -5px 3px -3px;
  animation: rotate 2s infinite linear;
}
@keyframes rotate {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(360deg);
  }
}
.loading:before {
  background-image: url('http://i.stack.imgur.com/UTnLP.png');
  background-size: cover;
  background-repeat: no-repeat;
  display: block;
  width: 100%;
  height: 100%;
  content: "";
  position: absolute;
  border-radius: 50%;
  z-index: -1000;
}

<div class="loading"></div>