section.container{ display:grid;grid-template-rows:auto;grid-template-columns:50px 1fr 1fr 50px ;grid-template-areas:"u a b v"; grid-gap:0.5em;}
div.bur1{background-color:lightgrey;font-size:1.2em;color:blue;grid-area:a;border:3px double red;padding:1em; }
div.bur2{background-color:lightgrey;font-size:1.2em;color:blue;grid-area:b;border:3px double red;padding:1em; }
h2.tuto{text-align:center;width:38%;border:3px double red;margin-left:25%;background-color:yellow;color:#00008B;border-radius:1em;margin-top:0%;font-size:1.2em;}
h2.tuto2{text-align:center;width:38%;border:3px double red;margin-left:20%;background-color:yellow;color:#00008B;border-radius:1em;margin-top:0%;font-size:1.2em;}
body{ background-color:#98FB98;color:blue;font-size:1.20em;height:auto;}
h1{text-align:center;border:3px double red;background-color:yellow;color:#00008B;border-radius:1em;font-size:1.70em;margin-left:30%;margin-top:2%;width:40%;height:20%;}
li.vid1{line-height:1.5em;color:darkblue;margin-left:18%;font-size:1em;}
li.vid2{line-height:2.4em;color:darkblue;margin-left:18%;font-size:1em;}
a{text-decoration:none}
a:link{ color:blue;}
a:visited{color:green}
a:hover{color:red}