header {
    height: 50px;
    background-color: #09101f;
    margin-bottom: 2px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

header:after {
    content: '';
    display: block;
    position: relative;
    width: 100%;
    height: 2px;
    background-image: -moz-linear-gradient( 0deg, rgb(49, 238, 213) 0%, rgb(24, 89, 187) 22%, rgb(73, 33, 185) 46%, rgb(238, 49, 89) 74%, rgb(238, 245, 50) 100%);
    background-image: -webkit-linear-gradient( 0deg, rgb(49, 238, 213) 0%, rgb(24, 89, 187) 22%, rgb(73, 33, 185) 46%, rgb(238, 49, 89) 74%, rgb(238, 245, 50) 100%);
    background-image: -ms-linear-gradient( 0deg, rgb(49, 238, 213) 0%, rgb(24, 89, 187) 22%, rgb(73, 33, 185) 46%, rgb(238, 49, 89) 74%, rgb(238, 245, 50) 100%);
}

header nav {
    width: 1170px;
    margin: 0 auto;
    height: 100%;
}

header nav a {
    color: #fff;
    flex-grow: 1;
    line-height: 45px;
    font-size: 1.5em;
    border: 1px dashed #142240;
    text-align: center;
    border-bottom: 0;
    -webkit-transition: all 0.2s ease-in-out;
    -moz-transition: all 0.2s ease-in-out;
    -ms-transition: all 0.2s ease-in-out;
    -o-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
}

header nav a:hover {
    background-color: #142240;
}

header nav a.active {
    background-color: #193d93;
    border-color: #193d93;
}