Amazing-NavBar-effect.css

@import url("https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700");

#Amazing-NavBar-effect {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: 'Open Sans', sans-serif;
    box-sizing: border-box;
    color: #333;
    font-size: 100%;
    line-height: 1.5;
    background-image: url(blacka.jpeg);
    background-size: cover;
}

nav {
    --duration: .5s;
    --easing: ease-in-out;
    position: relative;
    width: 220px;
    margin: 20px;
}

nav ol {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav li {
    margin: -4px 0 0 0;
}

nav a {
    display: block;
    text-decoration: none;
    background: #fff;
    transform-origin: 0 0;
    transition: transform var(--duration) var(--easing), color var(--duration) var(--easing);
    transition-delay: var(--delay-out);
    border-radius: 4px;
    padding: 1em 1.52em;
}

nav a:hover {
    background: #efefef;
}

nav .sub-menu a {
    font-size: .9em;
    color: #666666;
    border-left: 2em solid white;
    padding: .75em;
    background: linear-gradient(to right, #dddddd 2px, #ffffff 2px);
}

nav .sub-menu a:hover {
    background: linear-gradient(to right, #dddddd 2px, #efefef 2px);
}

nav header {
    font-weight: 600;
    display: block;
    background: rgba(255, 255, 255, 0.5);
    transform-origin: 0 0;
    transition: transform var(--duration) var(--easing), color var(--duration) var(--easing);
    transition-delay: var(--delay-out);
    border-radius: 4px;
    padding: 1em 1.52em;
}

nav header span {
    border: none;
    background: transparent;
    font-size: 1.5em;
    padding: 0;
    cursor: pointer;
    line-height: 1;
    float: right;
}

nav footer button {
    position: absolute;
    top: 0;
    left: 0;
    border: none;
    padding: calc(1em - 2px);
    width: 100%;
    transform-origin: 0 0;
    transition: transform var(--duration) var(--easing);
    transition-delay: calc(var(--duration) + (.1s * (var(--count) / 2)));
    cursor: pointer;
    outline: none;
    background: #cdcdcd;
    opacity: 0;
}

nav.closed a,
nav.closed header {
    transform: translateY(calc(var(--top) * -1)) scaleY(0.1) scaleX(0.2);
    transition-delay: var(--delay-in);
    color: transparent;
}

nav.closed footer button {
    transition-delay: 0s;
    transform: scaleY(0.7) scaleX(0.2);
}