* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Helvetica, sans-serif;
}
body {
    background: whitesmoke; 
    min-height: 100vh;
    margin: 1em;
        overflow: hidden;
}
.vertical-center {
  margin: 0;
  position: absolute;
  top: 50%;
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}
.head {
    padding-bottom: 11em;
}  
.sticky {
   position: fixed;
   bottom: 0;
   right: 0;
   font-family: Arial, Helvetica, sans-serif;
   text-align: left;
   font-size: 15px;
   font-weight: bolder;
   margin-bottom: 0px;
   margin-right: 5px;
   color:black;
}
.bold {
    font-weight: 600;
}
a {
    color: black;
    text-decoration: none;
    font-weight: 600;
}
a:visited {
    color: black;
}
.sticky:hover {
    font-size:150%;
}
.back {
    margin-top: 5em;
    font-size: 40px;
    font-weight: 600;
}
a:hover {
  color: red;
}
.tungous {
  font-weight: bolder;
  font-size:x-large;
}
.tungous:hover {
  font-size: 600%;
}
.folder {
    height: 50px;
    width: 60px;
    margin-bottom: -0.5rem;
    margin-right: 0.5rem;
}
.folder:hover {
    height: 70px;
    width: 80px;
}
.container {
    width: 100%;
    overflow: hidden;
}
.container .text {
     position: relative;
     font-size: 2.5em;
     font-weight: 600;
}
.container .text.first-text {
    color: rgb(81, 81, 81);
}
.text.sec-text:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: whitesmoke;
    border-left: 2px solid black;
    animation: animate 4s steps(20) infinite;
} @keyframes animate {
    40%, 60% {
        left: calc(100% + 4px);
    }
    100% {
        left: 0%;
    }
} 
/* ----------- iPhone 4 and 4S ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 480px)
  and (-webkit-min-device-pixel-ratio: 2) {

}

/* Portrait */
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 480px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: portrait) {
}

/* Landscape */
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 480px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: landscape) {

}

/* ----------- iPhone 5, 5S, 5C and 5SE ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 568px)
  and (-webkit-min-device-pixel-ratio: 2) {

}

/* Portrait */
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 568px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: portrait) {
}

/* Landscape */
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 568px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: landscape) {

}

/* ----------- iPhone 6, 6S, 7 and 8 ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device-width: 375px) 
  and (max-device-width: 667px) 
  and (-webkit-min-device-pixel-ratio: 2) { 

}

/* Portrait */
@media only screen 
  and (min-device-width: 375px) 
  and (max-device-width: 667px) 
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: portrait) { 

}

/* Landscape */
@media only screen 
  and (min-device-width: 375px) 
  and (max-device-width: 667px) 
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: landscape) { 

}

/* ----------- iPhone 6+, 7+ and 8+ ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device-width: 414px) 
  and (max-device-width: 736px) 
  and (-webkit-min-device-pixel-ratio: 3) { 

}

/* Portrait */
@media only screen 
  and (min-device-width: 414px) 
  and (max-device-width: 736px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: portrait) { 

}

/* Landscape */
@media only screen 
  and (min-device-width: 414px) 
  and (max-device-width: 736px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: landscape) { 

}

/* ----------- iPhone X ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device-width: 375px) 
  and (max-device-width: 812px) 
  and (-webkit-min-device-pixel-ratio: 3) { 

}

/* Portrait */
@media only screen 
  and (min-device-width: 375px) 
  and (max-device-width: 812px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: portrait) { 

}

/* Landscape */
@media only screen 
  and (min-device-width: 375px) 
  and (max-device-width: 812px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: landscape) { 

}
/* 2340x1080 pixels at 476ppi */
@media only screen 
    and (device-width: 375px) 
    and (device-height: 812px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: portrait)  { 

}
/* 2340x1080 pixels at 476ppi */
@media only screen 
    and (device-width: 375px) 
    and (device-height: 812px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: landscape)  {
    
    }
/* 2532x1170 pixels at 460ppi */
@media only screen 
    and (device-width: 390px) 
    and (device-height: 844px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: portrait)  {

    }
/* 2532x1170 pixels at 460ppi */
@media only screen 
    and (device-width: 390px) 
    and (device-height: 844px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: landscape) {

     }
     /* 2778x1284 pixels at 458ppi */
@media only screen 
    and (device-width: 428px) 
    and (device-height: 926px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: portrait) { }
    /* 2778x1284 pixels at 458ppi */
@media only screen 
    and (device-width: 428px) 
    and (device-height: 926px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: landscape)  { }
    /* 1792x828px at 326ppi */
@media only screen 
    and (device-width: 414px) 
    and (device-height: 896px) 
    and (-webkit-device-pixel-ratio: 2)
    and (orientation: portrait) 
 { }
    /* 1792x828px at 326ppi */
@media only screen 
    and (device-width: 414px) 
    and (device-height: 896px) 
    and (-webkit-device-pixel-ratio: 2)
    and (orientation: landscape) 
 { }
 /* 2436x1125px at 458ppi */
@media only screen 
    and (device-width: 375px) 
    and (device-height: 812px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: portrait) 
 { }
    /* 2436x1125px at 458ppi */
@media only screen 
    and (device-width: 375px) 
    and (device-height: 812px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: landscape) 
 { }
/* 2688x1242px at 458ppi */
@media only screen 
    and (device-width: 414px) 
    and (device-height: 896px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: portrait) 

     { }
     /* 2688x1242px at 458ppi */
@media only screen 
    and (device-width: 414px) 
    and (device-height: 896px) 
    and (-webkit-device-pixel-ratio: 3)
    and (orientation: landscape) 

     { }