style.css

/* modification for prism.css */

code[class*="language-"], pre[class*="language-"] {
    tab-size: 1;
}

/* end modification for prism.css */
body {
    margin: 0;
    padding: 0;
    font-family: 'Raleway', sans-serif;
}


.page {
    position: relative;
    display: inline-block;
    text-align: center;
    margin: auto;
    width: 80%;
}

.row_circle {
    padding: 2vw;
    background-image:
    repeating-linear-gradient(0deg,
    rgba(0,0,0,0.1) 0px,
    rgba(0,0,0,0.1) 5px,
    transparent 5px,
    transparent 10px);
    background-repeat: no-repeat;
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
}

.box_circle {
    margin: auto;
    position: relative;
    width: 200px;
    height: 200px;
    border-radius: 100%;
}

.circle  {
    width: 200px;
    height: 200px;
    border-radius: 100%;
    border-style: solid;
    border-width: 100px;
    border-color: #005F6B;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    transition: 0.3s ease;
    -webkit-transition: 0.3s ease;
    -moz-transition: 0.3s ease;
    -ms-transition: 0.3s ease;
    -o-transition: 0.3s ease;
}

.box_circle:hover .circle{
    border-width: 0;
    border: 1px solid darkcyan;
}

.box_circle span {
    position: relative;
    bottom: 110px;
    color: white;
}

.box_circle:hover span {
    color: darkcyan;
}

.box_circle span::before {
    content: "";
    position: absolute;
    width: 50%;
    height: 2px;
    left: 25%;
    bottom: -5px;
    background-color: darkcyan;
    visibility: hidden;
    -webkit-transform: scaleX(0);
    transform: scaleX(0);
    -webkit-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
}

.box_circle:hover span::before {
    visibility: visible;
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
}

.section {
    width: 100%;
    height: 50vh;
    position: relative;
    display: inline-block;
    overflow: hidden;
}

.section_left {
    width: 50%;
    height: 100%;
    background-color: darkcyan;
    animation-name: jump;
    animation-duration: 4s;
    display: inline-block;
    float: left;
    z-index: 2;
}

.ball {
    animation-direction:alternate-reverse;
    border-radius: 6px;
    animation-duration: 60s;
    position: absolute;
    animation-fill-mode: forwards;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    z-index: -1;
}

.atelier {
    margin: auto;
    margin-top: 20vh;
}

.atelier h2 {
    margin: auto;
    display: block;
    color: white;
    font-size: 2em;
    vertical-align: center;
    margin-bottom: 2%;
    z-index: 1;
}

.atelier a {
    margin: auto;
    display: block;
    /*background-color: none;*/
    text-decoration: none;
    padding: 10px;
    border: 1px solid white;
    border-radius: 3px;
    color: white;
    width: 18vh;
    height: 4vh;
    text-align: center;
    transition: all .2s linear;
    z-index: 2;
    overflow: hidden;
    position: relative;
}

.atelier a::before {
    content: "PLAY";
    position: absolute;
    top: 6px;
    left: 0;
    margin: auto;
    width: 18vh;
    height: 5vh;
    text-align: center;
    z-index: 1;
    transition: all .2s ease-in-out;
}

.atelier a::after {
    content: "S'ENTRAINER";
    position: absolute;
    top: 30px;
    margin: auto;
    width: 18vh;
    left: 0;
    height: 5vh;
    text-align: center;
    z-index: 1;
    transition: all .2s ease-in-out;
}

.atelier:hover a:hover {
    background-color: rgba(255,255,255,0.8);
    color: darkcyan;
    text-align: center;

}
.atelier a:hover::before {
    top:-3vh;
}

.atelier a:hover::after {
    top:0.7vh;
}

.section_right {
    width: 50%;
    height: 100%;
    display: inline-block;
    float: left;

}
.tutoriel {
    width: 100%;
    height: 50%;
    float: left;
    background-color: #002A4A;
}

.tutoriel a {
    height: 100%;
}
.tutoriel h2 {
    position: relative;
    width: 100%;
    height: inherit;
    color: white;
    font-size: 1.4rem;
    margin: auto;
    line-height: 26vh;
    font-weight: 100;
    z-index: 2;
    overflow: hidden;
}

.tutoriel h2::before {
    content:"SE FORMER";
    font-family: 'Raleway:800', sans-serif;
    width: 100%;
    height: 75px;
    position: absolute;
    top: 0px;
    left: 0;
    margin:0;
    text-align: center;
    z-index: 1;
    transition: all .5s ease-in-out;
}

.tutoriel h2::after {
    content:"DECHIFFRER";
    font-family: 'Raleway:800', sans-serif;
    width: 100%;
    height: 75px;
    position: absolute;
    top: 24vh;
    left: 0;
    margin:0;
    text-align: center;
    z-index: 1;
    transition: all .5s ease-in-out;
}

.tutoriel:hover h2::before {
    top: -24vh;;
}

.tutoriel:hover h2::after {
    top: 0vh;
}

.reference {
    width: 100%;
    height: 50%;
    float: left;
    background-color: #071E3D;
}
.reference a {
  height: 100%;

}
.reference h2 {
  line-height: 26vh;
    height: inherit;
    color: white;
    font-size: 1.4rem;
    margin: 0;
    font-weight: 100;
}


footer {
    width: 100%;
    height: 165px;
}

.copyright{
    height: 100%;
    display: flex;
    justify-content: center;

}

.copyright .c {
    color: darkgrey;
    align-self: center;
}

.copyright .vingt {
    color: aquamarine;
    opacity: 0.3;
    align-self: flex-start;
    font-size: 7em;
}

.copyright .seize {
    color: aquamarine;
    opacity: 0.8;
    align-self: flex-end;
    font-size: 7em;
    margin-left: -45px;
}


@media (max-width: 1100px) {
    header {
        position: relative;
        width: 100%;
        /*background-color: none;*/
        z-index: 10;
        overflow: hidden;
        display: block;
    }
    header .logo {
        width: 100%;
        text-align: center;
    }
    .logo img {
        width: 50%;
    }
    .page {
        width: 80%;
        height: 100%;
    }

    .row_circle {
        padding: 1em;
        width: 100%;
        background-image:
        repeating-linear-gradient(0deg,
        rgba(0,0,0,0.1) 0px,
        rgba(0,0,0,0.1) 5px,
        transparent 5px,
        transparent 10px);
    }

    .circle  {
        width: 150px;
        height: 150px;
        border-radius: 100%;
        border-style: solid;
        border-width: 75px;
        border-color: #005F6B;
        box-sizing: border-box;
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        transition: 0.3s ease;
        -webkit-transition: 0.3s ease;
        -moz-transition: 0.3s ease;
        -ms-transition: 0.3s ease;
        -o-transition: 0.3s ease;
    }

    .box_circle span {
        bottom: 85px;
    }

    .section {
        overflow: visible;
    }
    .section_left {
        height: 50%;
        margin-bottom: 0.3em;
    }
    .section_left, .section_right {
        width: 100%;
    }
    .section_right {
        height: 100%;
    }
    .tutoriel, .reference {
        height: 50%;
    }
    .tutoriel {
        margin-bottom: 0.3em;
    }
    .atelier a::before {
        top: 0.5vh;
    }
    .atelier h2 {
        margin-top: 0;
        font-size: 1.5rem;
    }
    .atelier {
        margin-top: 8vh;
    }

    footer {
        display: none;
    }

}
@media (max-width: 1100px){
        .box_circle
        {
        width: 150px;
        border-radius: 100%;
        height: 150px;
        }
}
@media (max-width: 760px) {

    .page {
        border: 1px darkcyan solid;
        padding: 1em;
    }

    .row_circle {
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        padding: 0;
        background: inherit;
    }

    .circle  {
        width: 100%;
        height: 75px;
        border-radius: 0%;
        border-style: solid;
        border-width: 0px;
        background-color: #005F6B;
        box-sizing: border-box;
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
    }

    .box_circle {
        width: 100%;
        height: 75px;
    }

    .box_circle span {
        bottom: 50px;
    }

    .box_circle:hover .circle{
        border-width: 0;
        border: 1px solid darkcyan;
    }

    #transfo {
        display: none;
    }

    .section {
        height: 60%;
    }

    .section_left, .reference {
        display: none;
    }

    footer {
        display: none;
    }
}