How to use pure CSS to achieve the burning effect of mosquito coils (source code attached)

The content of this article is about how to use pure CSS to achieve the traditional mosquito coil burning effect (source code attached). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. helped.

Effect preview

##Source code download

Please download all the source code of the daily front-end practical series from github:

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

Code interpretation

Define dom, the container contains 8 sub-elements:

<div>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
</div>

Centered display:

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

Draw the frame for the incense plate:

.coil {
    position: relative;
    display: flex;
    justify-content: center;
}

.coil span {
    position: absolute;
    width: calc((var(--n) * 2 - 1) * 1em);
    height: calc((var(--n) - 0.5) * 1em);
    border: 1em solid darkgreen;
}

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

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

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

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

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

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

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

.coil span:nth-child(8) {
    --n: 8;
}

Place half of the frame above:

.coil span:nth-child(odd) {
    align-self: flex-end;
}

Delete the upper frame The lower border of the line, and the upper border of the lower frame line:

.coil span:nth-child(odd) {
    border-bottom: none;
}

.coil span:nth-child(even) {
    border-top: none;
}

Align the upper and lower borders:

.coil span:nth-child(even) {
    transform: translateX(-1em);
}

Change the border to a curve:

.coil span:nth-child(odd) {
    border-radius: 50% 50% 0 0 / 100% 100% 0 0;
}

.coil span:nth-child(even) {
    border-radius: 0 0 50% 50% / 0 0 100% 100%;
}

Use pseudo elements to draw mosquito coils The middle part:

.coil::before {
    content: '';
    position: absolute;
    width: 1em;
    height: 1em;
    background-color: darkgreen;
    border-radius: 50%;
    left: -1.5em;
    top: -0.5em;
}

Use pseudo elements to draw the ignition point of the mosquito coil:

.coil::after {
    content: '';
    position: absolute;
    width: 1em;
    height: 1em;
    border-radius: 50%;
    top: -0.5em;
    background-color: darkred;
    left: -9.5em;
    z-index: -1;
    transform: scale(0.9);
    box-shadow: 0 0 1em white;
}

Finally, add a flashing effect to the ignition point:

.coil::after {
    animation: blink 1s linear infinite alternate;
}

@keyframes blink {
    to {
        box-shadow: 0 0 0 white;
    }
}

Done!

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