*{
    margin: 0px;
    padding: 0px;
}




body {
    margin: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url(pronet.jpg);
    background-attachment: fixed;
    background-size: cover;
    background-position: center center;
}

.context {
    width: 100%;
    position: absolute;
    top:50vh;
   

    
}
.context h1{
    text-align:left;
    color: #7198cd;
    font-size: 50px;
}



.circles{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.circles li{
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: #7d93a6;
    animation: animate 25s linear infinite;
    bottom: -150px;
    
}

.circles li:nth-child(1){
    left: 25%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles li:nth-child(2){
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles li:nth-child(3){
    left: 70%;
    width: 20px;
    height: 20px;
    animation-delay: 4s;
}

.circles li:nth-child(4){
    left: 40%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 18s;
}

.circles li:nth-child(5){
    left: 65%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles li:nth-child(6){
    left: 75%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles li:nth-child(7){
    left: 35%;
    width: 150px;
    height: 150px;
    animation-delay: 7s;
}

.circles li:nth-child(8){
    left: 50%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles li:nth-child(9){
    left: 20%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles li:nth-child(10){
    left: 85%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}



@keyframes animate {

    0%{
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }

    100%{
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }

}

a{
    text-decoration: none;
    color: #7198cd;
}


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

nav ul li {
    --c: goldenrod;
    color: #7d93a6;
    font-size: 16px;
    border: 0.1em solid #7d93a6;
    border-radius: 4.5em;
    width: 18em;
    height: 3em;
    text-transform: uppercase;
    font-weight: bold;
    font-family: sans-serif;
    letter-spacing: 0.1em;
    text-align: center;
    line-height: 3em;
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: 0.5s;
    margin: 1em;
}

nav ul li span {
    position: absolute;
    width: 25%;
    height: 100%;
    background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(21,21,72,1) 35%, rgba(3,111,133,1) 85%);
    transform: translateY(150%);
    border-radius: 50%;
    left: calc((var(--n) - 1) * 25%);
    transition: 0.5s;
    transition-delay: calc((var(--n) - 1) * 0.1s);
    z-index: -1;
}

nav ul li:hover {
    color: black;
}

nav ul li:hover span {
    transform: translateY(0) scale(2);
}

nav ul li span:nth-child(1) {
    --n: 1;
}

nav ul li span:nth-child(2) {
    --n: 2;
}

nav ul li span:nth-child(3) {
    --n: 3;
}

nav ul li span:nth-child(4) {
    --n: 4;
}