* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}

.building {
    display: grid;
    gap: 24px;
    justify-items: center;
}

.loader {
    position: relative;
    width: 96px;
    height: 72px;
    border-bottom: 8px solid #1f2937;
}

.block {
    position: absolute;
    bottom: 8px;
    width: 24px;
    height: 24px;
    background: #2563eb;
    animation: build 1.6s ease-in-out infinite;
}

.block:nth-child(1) {
    left: 0;
    animation-delay: 0s;
}

.block:nth-child(2) {
    left: 36px;
    animation-delay: 0.2s;
}

.block:nth-child(3) {
    left: 72px;
    animation-delay: 0.4s;
}

.text {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 0;
}

@keyframes build {
    0%, 100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-32px);
    }
}