body{
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(midnightblue, black);
}

.loader {
    width: calc(1em * 7 + 0.15em * 6);
    height: 1.5em;
    font-size: 20px;
    display: flex;
    justify-content: space-between;
}

.loader span {
    width: 1em;
    background-color: deepskyblue;
    border-radius: 0.1em;
    transform: skewX(-25deg) scale(0.1);
    animation: animate 0.8s infinite alternate;
    filter: opacity(0);
    animation-delay: calc((var(--n) - 1) * 0.2s);
}

@keyframes animate {
    to {
        filter: opacity(1);
        transform: skewX(-25deg) scale(1);
    }
}

.loader span:nth-child(1) {
    --n: 1;
}

.loader span:nth-child(2) {
    --n: 2;
}

.loader span:nth-child(3) {
    --n: 3;
}

.loader span:nth-child(4) {
	--n: 4;
}

.loader span:nth-child(5) {
	--n: 5;
}

.loader span:nth-child(6) {
	--n: 6;
}

.loader span:nth-child(7) {
	--n: 7;
}