Front-end daily combat: # 30 video demonstrates how to create a pure CSS shaking bulletin board

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https://codepen.io/comehope/pen/wjZoGV

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https://scrimba.com/c/cD8yKHb

Source code download

Daily front-end combat series full source code can be downloaded from github:

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

Code Reading

Defined dom, the container comprising a bulletin board, a bulletin board hanging pin 3 and the fixed rope string:

<div class="signboard">
    <div class="sign">THANKS</div>
    <div class="strings"></div>
    <div class="pin top"></div>
    <div class="pin left"></div>
    <div class="pin right"></div>
</div>

Centered:

html, body {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center 60%, white, sandybrown);
}

Define the overall size of the billboard:

.signboard {
    width: 400px;
    height: 300px;
}

Set wood style:

.signboard {
    position: relative;
}

.sign {
    width: 100%;
    height: 200px;
    background: burlywood;
    border-radius: 15px;
    position: absolute;
    bottom: 0;
}

Provided with an engraving effect text style:

.sign {
    color: saddlebrown;
    font-family: sans-serif;
    font-weight: bold;
    text-align: center;
    line-height: 200px;
    text-shadow: 0 2px 0 rgba(255, 255, 255, 0.3),
                0 -2px 0 rgba(0, 0, 0, 0.7);
}

Draw string:

.strings {
    width: 150px;
    height: 150px;
    border: 5px solid brown;
    position: absolute;
    border-right: none;
    border-bottom: none;
    transform: rotate(45deg);
    top: 38px;
    left: 122px;
}

Draw string of top pushpin:

.pin {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    position: absolute;
}

.pin.top {
    background: gray;
    left: 187px;
}

Shown left and right sides of the pin on the board:

.pin.left,
.pin.right {
    background: brown;
    top: 110px;
    box-shadow: 0 2px 0 rgba(255, 255, 255, 0.3);
}

.pin.left {
    left: 80px;
}

.pin.right {
    right: 80px;
}

Finally, let's shake up signs:
(here by a small Lei-lei has proposed changes to the top of the rotation axis as a pushpin, the effect is better than the original)

.signboard {
    animation: swing 1.5s ease-in-out infinite alternate;
    transform-origin: 200px 13px;
}

@keyframes swing {
    from {
        transform: rotate(10deg);
    }

    to {
        transform: rotate(-10deg);
    }
}

We're done!