body
    {
    width: 100%;
    background-color: rgba(255, 255, 255, 0)!important;
    min-height: 0px!important;
    }

section, .mdl-tabs
    {
    max-width: 1280px;
    margin: auto;
    }

.logo_img
    {
    padding-bottom: 10px;    
    }

.nav_border
    {
    border-left: solid 3px yellow;
    line-height: 28px;
    }

li
    {
    list-style: none;
    color: yellow;
    font-family: "Roboto","Helvetica","Arial",sans-serif;
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 0px;
    line-height: 28px;
    list-style-image: none;
    list-style-position: outside;
    list-style-type: none;
    position: relative;
    }

li a
    {
    color: #292929!important;
    text-decoration: none;
    text-decoration-color: rgb(0, 188, 212);
    text-decoration-line: none;
    text-decoration-style: solid;
    transition: 2s;
    }

li a:hover
    {
    color: rgba(41, 41, 41, 0.25)!important;
    transition: 1s;
    }

.container
    {
    display: flex; /* or inline-flex */
    flex: wrap;
    }

.item_6
    {
    width: 50vw;
    height: 150px;
    
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);
    }

.item_2
    {
    width: 50vw;
    height: 400px;
    
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);
    }

#TP1
    {
    background-image: url(../image/software/povray/TP1.jpg);
    background-size: cover;
    background-position: center;
    }

#TP2
    {
    background-image: url(../image/software/povray/TP2.jpg);
    background-size: cover;
    background-position: center;
    }

#TP3
    {
    background-image: url(../image/software/povray/TP3.jpg);
    background-size: cover;
    background-position: center;
    }

#TP4
    {
    background-image: url(../image/software/povray/TP4.jpg);
    background-size: cover;
    background-position: center;
    }

#TP5
    {
    background-image: url(../image/software/povray/TP5.jpg);
    background-size: cover;
    background-position: center;
    }

#TP6
    {
    background-image: url(../image/software/povray/TP6.jpg);
    background-size: cover;
    background-position: center;
    }

#TP7
    {
    background-image: url(../image/software/povray/TP7.jpg);
    background-size: cover;
    background-position: center;
    }

#TP8
    {
    background-image: url(../image/software/povray/TP13.jpg);
    background-size: cover;
    background-position: center;
    }

#TP9
    {
    background-image: url(../image/software/povray/TP9.jpg);
    background-size: cover;
    background-position: center;
    }

#TP10
    {
    background-image: url(../image/software/povray/TP10.jpg);
    background-size: cover;
    background-position: center;
    }

#TP11
    {
    background-image: url(../image/software/povray/TP11.jpg);
    background-size: cover;
    background-position: center;
    }

#TP12
    {
    background-image: url(../image/software/povray/TP12.jpg);
    background-size: cover;
    background-position: center;
    }

#TP13
    {
    background-image: url(../image/software/povray/TP8.jpg);
    background-size: cover;
    background-position: center;
    }

#TP14
    {
    background-image: url(../image/software/povray/TP14.jpg);
    background-size: cover;
    background-position: center;
    }

.twentytwenty-container
    {
    margin-top: 30px!important;
    margin-bottom: 30px!important;
    
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);
    }

.pdf_book
    {
    
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);
        
    }




.video_comp
    {
    width: 45%;
    /*height: 500px;*/
    display: inline-block;
    }

.aspect-ratio
    {
    
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 51%;
        
    background-color: black;
    
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);
    
    }

.aspect-ratio iframe {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0; top: 0;
}

.video_c
    {
    width: 48%;
    display: inline-block;
    padding: 10px;
    }

.youtube
    {
    margin-top: 25px!important;
        
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);   
    }

.video_container
    {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 100%;
    }

.video
    {
    /*display: inline-block;*/
    width: 30%;
    height: auto;
    min-width: 200px;
        
    border-bottom: 25%;
        
    margin: 5px;
    border-style: solid;
    border-color: yellow;
    border-width: 1px;
        
    -moz-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -webkit-box-shadow: 1px 1px 5px 0px #cfcfcf;
    -o-box-shadow: 1px 1px 5px 0px #cfcfcf;
    box-shadow: 1px 1px 5px 0px #cfcfcf;
    filter:progid:DXImageTransform.Microsoft.Shadow(color=#cfcfcf, Direction=134, Strength=5);     
    }