渐变焰火less

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@ratio: 1.5;

.flame {
position: absolute;
z-index: 99;
width: 16px*@ratio;
height: 26px*@ratio;
bottom: 410px;
left: calc(50% - 8px * @ratio);
background: linear-gradient(180deg, #ee2727 0%, #fba803 100%);
border-top-left-radius: 8px*@ratio 20px*@ratio;
border-top-right-radius: 8px*@ratio 20px*@ratio;
border-bottom-right-radius: 8px*@ratio;
border-bottom-left-radius: 8px*@ratio;
animation: wind 10s ease-in-out infinite,
size 12s ease-in-out infinite,
flickr 3.5s ease-in-out infinite;
transform-origin: 50% 100%;
transform: translate3d(0,0,0);
}

@keyframes wind {
0%, 22%, 49%, 62%, 81%, 100% {
border-top-left-radius: 2px*@ratio 20px*@ratio;
border-top-right-radius: 14px*@ratio 20px*@ratio;
border-bottom-right-radius: 8px*@ratio;
border-bottom-left-radius: 8px*@ratio;

}
14%, 32%, 56%, 70%, 89% {
border-top-left-radius: 14px*@ratio 20px*@ratio;
border-top-right-radius: 2px*@ratio 20px*@ratio;
border-bottom-right-radius: 8px*@ratio;
border-bottom-left-radius: 8px*@ratio;
}
}

@keyframes size {
0%, 22%, 49%, 62%, 81%, 100% {
transform: scale(1, 1);
}
14%, 32%, 56%, 70%, 89% {
transform: scale(0.9, 1.2);
}
}

@keyframes flickr {
0%, 22%, 49%, 62%, 81%, 100% {
box-shadow: 0 0 20px 0 rgba(255, 202, 0, 0.7);
}
14%, 32%, 56%, 70%, 89% {
box-shadow: 0 0 20px 0 rgba(255, 202, 0, .8);
}
}
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