about.css

body,main{
    height:100%;
    width: 100%;
    margin:0px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    box-sizing: border-box;
}
main {

    background-color:#212121;
    position: relative;
    height: 100%;
    min-height: 100vh;
    justify-content: center;
    padding-top: 5rem;
}
a {
    text-decoration: none;
    color:inherit;
    cursor: pointer;
    font-size: larger;
}
a:hover {
  color: aquamarine;
}
.about{
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    color: white;
    width: 90%;
    margin-inline: auto;
    position: absolute;
    z-index: 1;

}
.about h1 {
    font-size: 4rem;
}
p {
    margin-top: 0;
    text-align: left;
    letter-spacing: .1rem;
    font-size: 1.2rem;
}
.intro {
    margin-top: 3rem;
    font-size: 2rem ; 
}
.intro-sub{
    font-size: 1.5rem;
}
.circles{
    position: absolute;
    /* top: 0; */
    left: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    z-index: -1;
}

.circles li{
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 50s 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(-100vh) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }

}
@media screen and (max-width: 744px) {
    .about{
        position: relative;
    }
    .circles{
        height:0;
    }
  }