section {
    width:80%;
    margin:20px auto;
    text-align: justify;
}

ul, ol {
    margin-left:20px;
}

ol {
    list-style: decimal;
}

a {
    text-decoration: none;
    color: blue;
    transition-duration: 0.5s;
}

a:hover {
    color: green;
}

a:visited {
    color: blue;
}

.entete {
    font-size: 18pt;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 1px 1px black;
}

#titre .entete {
    text-align: center;
    font-size: 30pt;
}

.soustitre {
    text-decoration: underline;
    font-size:16pt;
    margin-bottom: 10px;
}

li {
    margin-left: 20px;
}

p, li {
    font-size: 14pt;
    margin-bottom: 10px;
    line-height: 25px;
}

.italic {
    font-style: italic;
}

.gras {
    font-weight: bold;
}

#retour {
    position: fixed;
    right:0;
    bottom:0;
}

.img {
    margin-bottom: 20px;
    text-align: center;
}

.img-jeu {
    background-image: url("../images/api-graphique-vulkan-1000x688.png");
    width:1000px;
    height:688px;
}

.img-pipeline {
    background-image: url("../images/gl1-pipeline-01.png");
    width:589px;
    height:941px;
}

.img-opengl {
    background-image: url("../images/OpenGL_logo_(Nov14).svg.png");
    width:640px;
    height:266px;
}

.img-vulkan {
    background-image: url("../images/vulkan_og.jpg");
    width:600px;
    height:316px;
}

.img-mobile {
    background-image: url("../images/vulkan-vs-open-gl-es-1000x558.png");
    width:1000px;
    height:558px;
}

.img-directx {
    background-image: url("../images/steamworkshop_webupload_previewfile_264396486_preview.png");
    width:256px;
    height:256px;
}

.img-bio {
    background-image: url("../images/Profil.jpg");
    background-size: 100%;
    margin-right: 20px;
    width:256px;
    height:256px;
    float:left;
}