html {
    box-sizing: border-box;
}

*, *:before, *:after {
    box-sizing: inherit;
}
  
html, body {
    background: linear-gradient(60deg, #ff2400, #e81d1d, #e8b71d, #e3e81d, #1de840, #1ddde8, #2b1de8, #dd00f3, #dd00f3);
    background-size: 1800% 1800%;
    animation: rainbow 25s ease infinite;
}

@keyframes rainbow { 
    0%{background-position:0% 82%}
    50%{background-position:100% 19%}
    100%{background-position:0% 82%}
}

body {
    margin: 0 auto;
    font-family: 'Comfortaa', sans-serif;
    min-height: 100vh;
}

h1 {
     color: #000;
     text-align: center;
     padding-top: 1em;
}

h3 {
    text-align: center;
    max-width: 1300px;
    margin: 0 auto;
    margin-bottom: 15px;
}

h4 {
    color: yellow;
}

nav {
    position: relative;
    perspective: 600px;
}

button {
    font-family: 'Comfortaa', sans-serif;
    color: #000000;
    text-decoration: none;
    font-size: 20px;
    background: rgba(255,255,0,0.5);
    padding: 10px 20px;
    display: inline-block;
    margin: 20px;
    width: 165px;
    border-radius: 5px;
    text-align: center;
    border: 1px solid black;
}

button:hover {
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}

.responsive > img {
    /* height: 150px;
    width: 150px; */
    width: 100%;
    height: auto;
}

.cool > li > a {
    color: yellow;
    text-decoration: none;
    font-size: 20px;
    background: rgba(0,0,0,0.2);
    padding: 10px 20px;
    display: inline-block;
    margin: 20px;
    width: 165px;
    border-radius: 5px;
    text-align: center;
}

nav ul {
    list-style: none;
    margin: 0;
    margin-bottom: 160px;
    padding: 0;
    display: flex;
    justify-content: center;
}

.cool > li {
    position: relative;
    display: flex;
    justify-content: center;
}

.dropdown {
    opacity: 0;
    position: absolute;
    overflow: hidden;
    padding: 20px;
    top: -20px;
    border-radius: 2px;
    transition: all 0.5s;
    transform: translateY(100px);
    will-change: opacity;
    display: none;
}

.trigger-enter .dropdown {
    display: block;
}

.trigger-enter-active .dropdown {
    opacity: 1;
}
  
.dropdownBackground {
    width: 100px;
    height: 100px;
    position: absolute;
    background: #000000;
    border-radius: 5px;
    box-shadow: 0 50px 100px rgba(50,50,93,.1), 0 15px 35px rgba(50,50,93,.15), 0 5px 15px rgba(0,0,0,.1);
    transition: all 0.3s, opacity 0.1s, transform 0.2s;
    transform-origin: 50% 0;
    display: flex;
    justify-content: center;
    opacity: 0;
}

.dropdownBackground.open {
    opacity: 1;
}

.arrow {
    position: absolute;
    width: 20px;
    height: 20px;
    display: block;
    background: #000000;
    transform: translateY(-50%) rotate(45deg);
}

.player {
    min-width: 450px;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1;
}

.player img {
    float: left;
    margin-right: 20px;
}

.sCloudPlayer {
    width: 50%;
    margin: 0 auto;
    margin-bottom: 1.25em;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 5px;
    animation-name: fadeIn;
    animation-duration: 0.4s;
}

@keyframes fadeIn {
    from {opacity: 0} 
    to {opacity: 1}
}