gallery.css

body {
    background: #FFF5EE;
}
.gallery {
    position: absolute;
    /*top: 95vw;*/
    /*top:100vw;*/
    left: 50%;
    padding: 20px;
    max-width: 100%;
    -webkit-transform: translateX(-50%) translateY(-50%);
    -moz-transform: translateX(-50%) translateY(-50%);
    transform: translateX(-50%) translateY(-50%);
    border: 1px solid #DE5D83;
    overflow: hidden;
}

@media only screen and (max-width: 768px) {
  /* For mobile phones: */
  .thumbnail {
    top:10vw;
  }
}

.gallery .inner {
    position: relative;
    overflow: hidden;
    display: block;
    width: auto; 
    max-width: 70vw; /*box width*/

}
.gallery img {
    display: none;
}
.main {    /*image display size*/
    position: relative;
    width: 100%;
    height: 40vw;
    overflow: hidden;
    background: #FFF5EE;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    overflow: hidden;
    margin-bottom: 20px;
}
.main:before {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 100px;
    
    background: -moz-linear-gradient(top,  rgba(0,0,0,0) 0%, rgba(0,0,0,0.7) 100%);
    background: -webkit-linear-gradient(top,  rgba(0,0,0,0) 0%,rgba(0,0,0,0.7) 100%);
    background: linear-gradient(to bottom,  rgba(0,0,0,0) 0%,rgba(0,0,0,0.7) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00000000', endColorstr='#a6000000',GradientType=0 );
}
.main-selected {
    animation: crossfade 0.5s ease;
    -webkit-animation: crossfade 0.5s ease;
    -moz-animation: crossfade 0.5s ease;
}
@keyframes crossfade {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}
    
@-webkit-keyframes crossfade {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}
    
@-moz-keyframes crossfade {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}
.main span {
    position: absolute;
    display: block;
    text-align: center;
    font-size: 16px;
    font-family: sans-serif;
    color: #fff;
    bottom: 10px;
    left: 0;
    right: 0;
}

.thumbnail{
    position:relative;
    top:25vw;
}
.thumb-roll {
    position: relative;
    width: auto;
    overflow-x: auto;
    overflow-y: hidden;	
    white-space: nowrap;
}
.thumb {   /*images*/
    display: inline-block;
    position: relative;
    width: 10vw;
    height: 10vw;
    margin-right: 20px;
    background: #ccc;
    overflow: hidden;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    overflow: hidden;
    cursor: pointer;
}
.thumb:last-of-type {
    margin-right: 0px;
}
.thumb:after { /*rectangle*/
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    box-shadow: inset 5px 5px 0px rgba(51, 204, 255, 0), inset -5px -5px 0px rgba(51, 204, 255, 0);
}
.thumb.current:after {
    box-shadow: inset 5px 5px 0px #DE5D83, inset -5px -5px 0px #DE5D83;
    background: rgba(255,255,255,0.4);
    cursor: default;
}
.thumb:hover:after {
    box-shadow: inset 5px 5px 0px #DE5D83, inset -5px -5px 0px #DE5D83;
}