body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: dodgerblue;
}

.cranes {
    width: 52em;
    height: 50em;
    font-size: 7px;
    color: white;
    position: relative;
}

.cranes span {
    border-left: calc(var(--left) * 1em) solid transparent;
    border-right: calc(var(--right) * 1em) solid transparent;
    border-bottom: calc(var(--bottom) * 1em) solid;
    position: absolute;
    transform: rotate(calc(var(--rotation) * 1deg));
    left: calc(var(--x) * 1em);
    top: calc(var(--y) * 1em);
    filter: opacity(0.6);
}

.cranes:hover span {
    animation: appear 1s ease-in;
}

@keyframes appear {
    from {
        border-left: 3em solid transparent;
        border-right: 3em solid transparent;
        border-bottom: 3em solid;
        position: absolute;
        transform: rotate(0deg);
        left: calc((52em - 3em) / 2);
        top: calc((50em - 3em) / 2);
    }
}

.head {
    --left: 13;
    --right: 6;
    --bottom: 2;    
    --x: 0;
    --y: 21;
    --rotation: -5;
}

.neck {
    --left: 6;
    --right: 6;
    --bottom: 12;
    --x: 14;
    --y: 19;
    --rotation: 75;
}

.side {
    --left: 1.5;
    --right: 11.5;
    --bottom: 20;
    --x: 18.8;
    --y: 15.1;
    --rotation: 20;
}

.wing {
    --left: 18.7;
    --right: 30;
    --bottom: 8;
    --x: 6.7;
    --y: 9.2;
    --rotation: -41.9;
}

.tail {
    --left: 18.6;
    --right: 7.7;
    --bottom: 3.9;
    --x: 19.6;
    --y: 38.1;
    --rotation: -126.5;
}

.belly {
    --left: 6.2;
    --right: 1.8;
    --bottom: 11.5;
    --x: 17.5;
    --y: 27.8;
    --rotation: -99;
}