* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style-type: none;
    user-select: none; 
  }
 
body{
    font-family:Verdana, Geneva, Tahoma, sans-serif;
    line-height: 1.5;
    margin: 0;
    padding: 0;
 }
 
 
.viewport {
   overflow: hidden;
   position: relative;
   width:calc((100vw - 20px) / 5);
   height:calc((100vw - 20px) / 5);
   float:left;
   border:1px solid white;
}

.current{
    border:3px solid red;
}

img.clipped {
   display: block;
   position: absolute;
}

#image {
    position: absolute;
    max-width:100vw;
    max-height: 100vh;
}

/* .block {
    z-index: 997;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    position: fixed;
    visibility: hidden;
 }
 
 #block-dark {
    background-color:#222;
    opacity: 0.80;
 } */
  
.popup{
    display: none;
    position: fixed;
    z-index: 1000;
    overflow-x: auto; 
    overflow-y: auto; 
 
    margin: 0 auto;
    padding: 0;  
    color: #fff;
    
    text-decoration: none;
    user-select: none;
 
    width: 100vw;
    height: 100vh;
 
    background-color: black;
    border: 0;
 }

 .nav{
    position: relative;
    z-index: 1001;
    top: calc(100vh - 60px);
    width:125px;
    height:30px;
    padding:5px;
    margin-right:25px;
 }