/* .viewer
------------------------- */
.viewer {
    margin: 0 auto;
    width: 100%;
    position: relative;
    overflow: hidden;
}
.viewer ul {
    width: 100%;
    overflow: hidden;
    position: relative;
}
.viewer ul li {
    top: 0;
    left: 0;
    width: 100%;
    position: absolute;
}
.viewer ul li img {
    width: 100%;
}
 
/* sideNavi
------------------------- */
.viewer .btnPrev,
.viewer .btnNext {
    margin-top: -25px;
    top: 50%;
    width: 50px;
    height: 50px;
    position: absolute;
    z-index: 101;
}
.viewer .btnPrev {
    left: 10px;
    background: #ccc;
}
.viewer .btnNext {
    right: 10px;
    background: #ccc;
}
 
 
/* =======================================
    ClearFixElements
======================================= */
.viewer ul:after {
    content: ".";
    height: 0;
    clear: both;
    display: block;
    visibility: hidden;
}
 
.viewer ul {
    display: inline-block;
    overflow: hidden;
}
/* Navigation arrows do not depend on missing btnPrev/btnNext images. */
.viewer .btnPrev::after, .viewer .btnNext::after {
  content: ""; position: absolute; top: 50%; left: 50%; width: 12px; height: 12px;
  border-top: 2px solid #333; border-right: 2px solid #333;
}
.viewer .btnPrev::after { transform: translate(-25%, -50%) rotate(-135deg); }
.viewer .btnNext::after { transform: translate(-75%, -50%) rotate(45deg); }