style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;400;700&display=swap');

body {
    background-color: #131316;
    color: #ffffff;
    font-family: 'Poppins', sans-serif;
    padding: 0;
    margin: 0;
}

section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height : 400px;
    padding: 100px 20vw;
}

.blue{
    background: #3c31dd;
}

.red {
    background: #dd3f31;
}

.green {
    background: #00ff00;
}

.yellow {
    background: #ff0;
}

.pink{
    background: #ffc0cb;
}

.curve {
    position: absolute;
    height: 225px;
    width: 100%;
    bottom: 0;
}

.curve::before {
    content: '';
    position: absolute;
    display: block;
    border-radius : 100% 50%;
    width: 55%;
    height: 100%;
    background-color: #202731;
    transform: translate(85%, 60%);

}

.curve::after {
    content: '';
    position: absolute;
    display: block;
    border-radius : 100% 50%;
    width: 55%;
    height: 100%;
    background-color: #3c31dd;
    transform: translate(-4%, 40%);
    z-index: -1;

}

.spacer {
    aspect-ratio: 900/600;
    width: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

.layer1 {
    background-image: url(./layered-waves-haikei.svg);
}

.layer2 {
    background-image: url(./layer2.svg);
}

.flip {
    transform: rotate(180deg);
}