@font-face {
    font-family: "SourceSansPro";
    src: url("fonts/Source_Sans_Pro/SourceSansPro-Regular.ttf") format("truetype");
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: "SourceSansPro";
    src: url("fonts/Source_Sans_Pro/SourceSansPro-ExtraLight.ttf") format("truetype");
    font-weight: 200;
    font-style: normal;
}

@font-face {
    font-family: "SourceSansPro";
    src: url("fonts/Source_Sans_Pro/SourceSansPro-Bold.ttf") format("truetype");
    font-weight: bold;
    font-style: normal;
}

body {
    background: #091732 url(img/mtn.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}
html {
    height: 100%
}

#presentation {
    position: absolute;
    width: 55%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.5);
    padding: 10px;
    text-align: center;
    font-family: 'SourceSansPro', sans-serif;
}

#presentation h1 {
    font-size: 3em;
    font-weight: bold;
    color: #fff;
    line-height: 25px;
}

#presentation h2 {
    color: #fff;
    font-size: 2em;
    font-weight: normal;
    line-height: 20px;
}

#presentation h3 {
    font-size: 1.5em;
    font-weight: 200;
    color: #fff;
}

#presentation h3 a {
    text-decoration: none;
    color: #fff;
}

#presentation h3 a:hover {
    text-decoration: underline;
}

#social{
    margin-top: 35px;
    padding: 0;
    font-size: 30px;
    text-shadow: 0px 1px 2px rgba(255, 255, 255, .8);
    list-style: none outside;
    text-align: center;
}

#social li {
    display: inline-block;
    margin: 0 15px;
    padding: 0;
    line-height: 18px;
}

a svg #twitter,
a svg #linkedin,
a svg #hackerone,
a svg #medium,
a svg #github{
    transition: 200ms;
    transition-timing-function: ease-in-out;
    -webkit-transition: 200ms;
    -webkit-transition-timing-function: ease-in-out;
}

svg {
    width: 50px;
    height: 50px;
}

a svg:hover #twitter,
a svg:hover #linkedin,
a svg:hover #hackerone,
a svg:hover #medium,
a svg:hover #github {
  fill: #18A6B3;
}

@media screen and (max-width: 850px) {
    #presentation {
        width: 80%;
    }
    #presentation h1 {
        font-size: 1.7em;
    }
    #presentation h2 {
        font-size: 1.3em;
    }
    #presentation h3 {
        font-size: 1em;
    }
    svg {
        width: 30px;
        height: 30px;
    }

    #social li {
        margin: 0 10px;
    }
}