html, body {
    height: 100%;
    width: 100%;
}

html {
    display: table;
    margin: auto;
}

body {
    background-color: #003372;
    display: table-cell;
    vertical-align: middle;
}

img.header {
    display: block;
    width: 90%;
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

hr {
    width: 50%;
    max-width: 800px;
    margin-top: 50px;
    margin-bottom: 50px;
    color: #ffffff;
}

div.social-icons {
    text-align: center;
}

div.social-icons a img {
    width: 15%;
    max-width: 100px;
    padding: 10px 0px 10px 30px;
    filter: invert(100%) sepia(1%) saturate(0%) hue-rotate(230deg) brightness(107%) contrast(101%);
    transition: 0.15s;
}
  
div.social-icons a img:hover {
    filter: invert(73%) sepia(82%) saturate(1528%) hue-rotate(332deg) brightness(101%) contrast(98%);
}