/*：源代码唯一下载链接: http://www.bootstrapmb.com/item/454(当前备注仅在演示里出现，下载源码不包含)*/.twentytwenty-handle:before, .twentytwenty-handle:after {  content: " ";  display: block;  width: 3px;  background: white;  height: 9999px;  position: absolute;  left: 50%;  margin-left: -1.5px;  z-index: 30;  -webkit-box-shadow: 0px 0px 12px rgba(51, 51, 51, 0.5);  -moz-box-shadow: 0px 0px 12px rgba(51, 51, 51, 0.5);  box-shadow: 0px 0px 12px rgba(51, 51, 51, 0.5); }.twentytwenty-before-label, .twentytwenty-after-label, .twentytwenty-overlay {  position: absolute;  top: 0;  width: 100%;  height: 100%; }.twentytwenty-before-label, .twentytwenty-after-label, .twentytwenty-overlay {  -webkit-transition-duration: 0.5s;  -moz-transition-duration: 0.5s;  transition-duration: 0.5s; }.twentytwenty-before-label, .twentytwenty-after-label {  -webkit-transition-property: opacity;  -moz-transition-property: opacity;  transition-property: opacity; }.twentytwenty-before-label:before, .twentytwenty-after-label:before {  color: white;  font-size: 13px;  letter-spacing: 0.1em; }.twentytwenty-before-label:before, .twentytwenty-after-label:before {  background: rgba(255, 255, 255, 0.2);  position: absolute;  top: 50%;  margin-top: -19px;  line-height: 38px;  padding: 0 20px;  -webkit-border-radius: 2px;  -moz-border-radius: 2px;  border-radius: 2px; }.twentytwenty-left-arrow, .twentytwenty-right-arrow {  width: 0;  height: 0;  border: 6px inset transparent;  position: absolute;  top: 50%;  margin-top: -6px; }.twentytwenty-container {  -webkit-box-sizing: content-box;  -moz-box-sizing: content-box;  box-sizing: content-box;  overflow: hidden;  position: relative;  -webkit-user-select: none;  -moz-user-select: none; }  .twentytwenty-container img {    position: absolute;    top: 0;    display: block; }  .twentytwenty-container>img {    width: 100%; }  .twentytwenty-container.active .twentytwenty-overlay, .twentytwenty-container.active :hover.twentytwenty-overlay {    background: rgba(0, 0, 0, 0); }    .twentytwenty-container.active .twentytwenty-overlay .twentytwenty-before-label,    .twentytwenty-container.active .twentytwenty-overlay .twentytwenty-after-label, .twentytwenty-container.active :hover.twentytwenty-overlay .twentytwenty-before-label,    .twentytwenty-container.active :hover.twentytwenty-overlay .twentytwenty-after-label {      opacity: 0; }  .twentytwenty-container * {    -webkit-box-sizing: content-box;    -moz-box-sizing: content-box;    box-sizing: content-box; }.twentytwenty-before-label {  opacity: 0; }  .twentytwenty-before-label:before {    content: "Before";    left: 10px; }.twentytwenty-after-label {  opacity: 0; }  .twentytwenty-after-label:before {    content: "After";    right: 10px; }.twentytwenty-overlay {  -webkit-transition-property: background;  -moz-transition-property: background;  transition-property: background;  background: rgba(0, 0, 0, 0);  z-index: 25; }  .twentytwenty-overlay:hover {    background: rgba(0, 0, 0, 0.5); }    .twentytwenty-overlay:hover .twentytwenty-after-label {      opacity: 1; }    .twentytwenty-overlay:hover .twentytwenty-before-label {      opacity: 1; }.twentytwenty-before {  z-index: 20; }.twentytwenty-after {  z-index: 10; }.twentytwenty-handle {  height: 38px;  width: 38px;  position: absolute;  left: 50%;  top: 50%;  margin-left: -22px;  margin-top: -22px;  border: 3px solid white;  -webkit-border-radius: 1000px;  -moz-border-radius: 1000px;  border-radius: 1000px;  -webkit-box-shadow: 0px 0px 12px rgba(51, 51, 51, 0.5);  -moz-box-shadow: 0px 0px 12px rgba(51, 51, 51, 0.5);  box-shadow: 0px 0px 12px rgba(51, 51, 51, 0.5);  z-index: 40; }  .twentytwenty-handle:before {    bottom: 50%;    margin-bottom: 22px;    -webkit-box-shadow: 0 3px 0 white, 0px 0px 12px rgba(51, 51, 51, 0.5);    -moz-box-shadow: 0 3px 0 white, 0px 0px 12px rgba(51, 51, 51, 0.5);    box-shadow: 0 3px 0 white, 0px 0px 12px rgba(51, 51, 51, 0.5); }  .twentytwenty-handle:after {    top: 50%;    margin-top: 22px;    -webkit-box-shadow: 0 -3px 0 white, 0px 0px 12px rgba(51, 51, 51, 0.5);    -moz-box-shadow: 0 -3px 0 white, 0px 0px 12px rgba(51, 51, 51, 0.5);    box-shadow: 0 -3px 0 white, 0px 0px 12px rgba(51, 51, 51, 0.5); }.twentytwenty-left-arrow {  border-right: 6px solid white;  left: 50%;  margin-left: -17px; }.twentytwenty-right-arrow {  border-left: 6px solid white;  right: 50%;  margin-right: -17px; }/*：源代码唯一下载链接: http://www.bootstrapmb.com/item/454(当前备注仅在演示里出现，下载源码不包含)*/