* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: #000;
}

.lights {
    --color-1: 255, 249, 82;
    --color-2: 0, 234, 255;
    --color-3: 247, 0, 148;
    display: flex;
    justify-content: center;
    flex-flow: wrap;
    gap: 30px 40px;
    padding-top: 2px;
    padding-bottom: 30px;
    overflow: hidden;
    pointer-events: none;
}

.lights li {
    flex: none;
    position: relative;
    list-style: none;
    width: 15px;
    height: 30px;
    border-radius: 50%;
}

.lights li:before {
    position: absolute;
    content: "";
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    background-color: #222;
    border-radius: 100%;
}

.lights li:after {
    position: absolute;
    content: "";
    z-index: -1;
    top: -2px;
    left: 50%;
    width: 54px;
    height: 5px;
    border-bottom: 1px solid #222;
    border-radius: 100%;
}

.lights li:last-child:after {
    display: none;
}

.lights li {
    background-color: rgba(var(--color-1), 1);
    box-shadow: 0 5px 24px 3px rgba(var(--color-1), 1);
    animation: lighting-1 1.25s infinite linear;
}

@keyframes lighting-1 {
    50% {
        background-color: rgba(var(--color-1), 0.25);
        box-shadow: 0 5px 24px 3px rgba(var(--color-1), 0.25);
    }
}

.lights li:nth-child(odd) {
    /* 1, 3, 5, ... */
    background-color: rgba(var(--color-2), 1);
    box-shadow: 0 5px 24px 3px rgba(var(--color-2), 0.8);
    animation: lighting-2 1.5s infinite linear;
}

@keyframes lighting-2 {
    50% {
        background-color: rgba(var(--color-2), 0.4);
        box-shadow: 0 5px 24px 3px rgba(var(--color-2), 0.3);
    }
}

.lights li:nth-child(4n + 2) {
    /* 2, 6, 10, 14, ... */
    background-color: rgba(var(--color-3), 1);
    box-shadow: 0 5px 24px 3px rgba(var(--color-3), 1);
    animation: lighting-3 1.5s infinite linear;
    animation-delay: 1.25s;
}

@keyframes lighting-3 {
    50% {
        background-color: rgba(var(--color-3), 0.25);
        box-shadow: 0 5px 24px 3px rgba(var(--color-3), 0.25);
    }
}