How to use pure CSS to implement a moving hand (source code attached)

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##Source code download

https:/ /github.com/comehope/front-end-daily-challenges

Code interpretation

Define dom, the 5

.finger elements in the container represent 5 fingers, The .thumb element represents the thumb, and the .palm element represents the palm:

Centered display:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(white, lightcyan);
}

defines the container size, where

outline The attribute is an auxiliary line:

.hand {
    width: 16em;
    height: 8em;
    font-size: 10px;
    outline: 1px dashed black;
}

Draw the palm:

.hand {
    position: relative;
    color: darksalmon;
}

.palm {
    position: absolute;
    width: 8em;
    height: 6em;
    background-color: currentColor;
    border-radius: 1em 4em;
    right: 0;
}

Draw the outline of the thumb:

.thumb {
    position: absolute;
    width: 9.6em;
    height: 3.2em;
    background-color: currentColor;
    border-radius: 3em 2em 2em 1em;
    right: 0;
    bottom: 1em;
    transform-origin: calc(100% - 2em) 2em;
    transform: rotate(-20deg);
    border-bottom: 0.2em solid rgba(0, 0, 0, 0.1);
    border-left: 0.2em solid rgba(0, 0, 0, 0.1);
}

Draw the nail on the thumb:

.thumb::before {
    content: '';
    position: absolute;
    width: 1.9em;
    height: 1.9em;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 60% 10% 10% 30%;
    bottom: -0.3em;
    left: 0.5em;
    border-right: 0.1em solid rgba(0, 0, 0, 0.1);
}

Draw the second half of the index finger close to the palm:

.finger:not(:first-child) {
    position: absolute;
    width: 6.4em;
    height: 3.5em;
    background-color: currentColor;
    right: 5.2em;
    bottom: 4em;
    transform-origin: 100% 2em;
    transform: rotate(10deg);
}

Draw the first half of the index finger:

.finger:not(:first-child)::before {
    content: '';
    position: absolute;
    width: 9em;
    height: 3em;
    background-color: currentColor;
    right: 4.2em;
    top: 0.2em;
    border-radius: 2em;
    transform-origin: calc(100% - 2em) 2em;
    transform: rotate(-60deg);
}

Set subscript variables for the other 4 fingers except the thumb , gradually shrinking and deepening in color from the index finger to the little finger:

.finger:not(:first-child) {
    --scale: calc(1 - (5 - var(--n)) * 0.2);
    transform: rotate(10deg) scale(var(--scale));
    filter: brightness(calc(100% - (5 - var(--n)) * 10%));
}

.finger:nth-child(2) { --n: 2; }
.finger:nth-child(3) { --n: 3; }
.finger:nth-child(4) { --n: 4; }
.finger:nth-child(5) { --n: 5; }

Use pseudo elements to draw the shadow of the hand:

.hand::before {
    content: '';
    position: absolute;
    width: 14em;
    height: 4.5em;
    background-color: black;
    border-radius: 4em 1em;
    top: 4em;
    filter: blur(1em) opacity(0.3);
}

Increase the animation effect of finger tapping on the desktop:

.finger:not(:first-child) {
    animation: tap-upper 1.2s ease-in-out infinite;
    animation-delay: calc((var(--n) - 2) * 0.1s);
}

@keyframes tap-upper {
    0%, 50%, 100% {
        transform: rotate(10deg) scale(var(--scale));
    }

    40% {
        transform: rotate(50deg) scale(var(--scale));
    }
}

Finally, don’t forget to delete the guide lines.

Done!

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