/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
body {
  background: #eee;
  font-size: 16px;
}

.content {
  box-sizing: border-box;
  position: relative;
  width: 90%;
  max-width: 800px;
  margin: 20px auto;
  padding: 30px;
  background: white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.1);
}

.mocked {
  display: block;
  background: #f4f4f4;
  width: 100%;
  height: 1em;
}
.mocked--heading {
  font-size: 3em;
}
.mocked--subtitle {
  font-size: 1.5em;
  width: 50%;
  margin-top: 0.5em;
}
.mocked--line {
  height: 1em;
  margin-top: 0.5em;
}
.mocked--line:first-child {
  margin-top: 1em;
}
.mocked--line:last-child {
  width: 50%;
}
.mocked--image {
  width: 200px;
  height: 200px;
}

.corner-share {
  width: 60px;
  height: 60px;
  position: absolute;
  right: 0;
  bottom: 0;
  background: #75d0ff;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  overflow: hidden;
  -webkit-transition: width, height, box-shadow;
  transition: width, height, box-shadow;
  -webkit-transition-duration: 0.4s;
          transition-duration: 0.4s;
}
.corner-share:before {
  content: '';
  display: block;
  width: 141.42136%;
  height: 141.42136%;
  position: absolute;
  top: -70%;
  left: -70%;
  z-index: 1;
  background: white;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.2);
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
  -webkit-transition: box-shadow 0.4s;
  transition: box-shadow 0.4s;
}
.corner-share:hover {
  width: 120px;
  height: 120px;
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.1);
}
.corner-share:hover:before {
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.4);
}
.corner-share:hover .corner-share__left,
.corner-share:hover .corner-share__right {
  opacity: 1;
}
.corner-share:hover > .icon {
  opacity: 0;
}
.corner-share > .icon {
  position: absolute;
  right: 18px;
  bottom: 18px;
  margin-right: -9px;
  margin-bottom: -9px;
  -webkit-transition: opacity 0.4s;
  transition: opacity 0.4s;
}
.corner-share__left, .corner-share__right {
  display: block;
  width: 84px;
  height: 84px;
  position: absolute;
  bottom: 0;
  opacity: 0;
  -webkit-transform: rotate(-45deg);
          transform: rotate(-45deg);
  -webkit-transition: opacity 0.4s;
  transition: opacity 0.4s;
}
.corner-share__left .icon, .corner-share__right .icon {
  position: absolute;
  bottom: 70%;
  margin-bottom: -14px;
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
}
.corner-share__left {
  background: #0080d1;
  right: 0;
  -webkit-transform-origin: bottom right;
          transform-origin: bottom right;
}
.corner-share__left .icon {
  left: 70%;
  margin-left: -14px;
}
.corner-share__right {
  background: #38b2ff;
  left: 100%;
  -webkit-transform-origin: bottom left;
          transform-origin: bottom left;
}
.corner-share__right .icon {
  right: 70%;
  margin-right: -14px;
}