html {
    background: black;
}

.main {
    color: #fff;
    font-family: Helvetica,"Helvetica Neue",Arial,"Lucida Grande", sans-serif;
    text-align: center;
    z-index: 1;
    margin: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

a:hover {
    letter-spacing: 2px;
    transition: .5s
}

#bld:hover {
    letter-spacing: 4px;
}

a {
    transition: .5s;
    text-decoration: none;
    color: #fff;
}

#vid {
    position: fixed;
    min-width: 103%;
    min-height: 103%;
    opacity: 1;
    width: auto;
    height: auto;
    z-index: -100;
    transform: translateX(-50%) translateY(-50%);
    background-size: cover;
    overflow: hidden;
    -webkit-filter: blur(15px);
    -moz-filter: blur(15px);
    -o-filter: blur(15px);
    -ms-filter: blur(15px);
    filter: blur(15px);
    background: rgba(7, 9, 21, .5);
    filter: brightness(42.5%);
    top: 50%;
    left: 50%
}