css3实现流星雨特效

用到css3知识:     radial-gradient 径向渐变，   filter， transform， animation以及  nth-child选择器等

 

html代码：

css3代码：

*{
    margin: 0;
    padding: 0;
}
body{
    background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
    height: 100vh;        /* == height: 100%  */
    overflow: hidden;
    font-family: 'Times New Roman', Times, serif;
    justify-content: center;
    align-items: center;
}

.container{
    position: relative;
    width: 100%;
    height: 100%;
    -webkit-transform: rotate(45deg);
            transform: rotateZ(45deg);
    -webkit-animation: sky 200000ms linear infinite;
            animation: sky 200000ms linear infinite;
}

.meteor{
    position: absolute;
    left: 50%;
    top: 50%;
    height: 2px;
    background: linear-gradient(-45deg, #5f91ff, rgba(0, 0, 255, 0));
    border-radius: 999px;
    -webkit-filter: drop-shadow(0 0 6px #699bff);
            filter: drop-shadow(0 0 6px #699bff);
    -webkit-animation: tail 3000ms ease-in-out infinite, shooting 3000ms ease-in-out infinite;
            animation: tail 3000ms ease-in-out infinite, shooting 3000ms ease-in-out infinite; 
}

.meteor::before, .meteor::after{
    content: '';
    position: absolute;
    top: calc(50% - 1px);
    right: 0;
    height: 2px;
    background: linear-gradient(-45deg, rgba(0, 0, 255, 0), #5f91ff, rgba(0, 0, 255, 0) );
    -webkit-transform: translateX(50%) rotateZ(45deg);
            transform: translateX(50%) rotateZ(45deg);
    border-radius: 100%;
    -webkit-animation: shining 3000ms ease-in-out infinite;
            animation: shining 3000ms ease-in-out infinite;
}

.meteor::after{
    -webkit-transform: translateX(50%) rotateZ(-45deg);
            transform: translateX(50%) rotateZ(-45deg);
}

/* 1 */
.meteor:nth-child(1){
    top: calc(50% - 185px);
    left: calc(50% - 150px);
    -webkit-animation-delay: 8888ms;
            animation-delay: 8888ms;
}
.meteor:nth-child(1)::before, .meteor:nth-child(1)::after, .meteor:nth-child(1)::after{
    -webkit-animation-delay: 8888ms;
            animation-delay: 8888ms;
}
/* 2 */
.meteor:nth-child(2){
    top: calc(50% - 50px);
    left: calc(50% - 180px);
    -webkit-animation-delay: 9288ms;
            animation-delay: 9288ms;
}
.meteor:nth-child(2)::before, .meteor:nth-child(2)::after, .meteor:nth-child(2)::after{
    -webkit-animation-delay: 9288ms;
            animation-delay: 9288ms;
}

.meteor:nth-child(3){
    top: calc(50% - 145px);
    left: calc(50% - 135px);
    -webkit-animation-delay: 8600ms;
            animation-delay: 8600ms;
}
.meteor:nth-child(3)::before, .meteor:nth-child(3)::after, .meteor:nth-child(3)::after{
    -webkit-animation-delay: 8600ms;
            animation-delay: 8600ms;
}

.meteor:nth-child(4){
    top: calc(50% - 78px);
    left: calc(50% - 155px);
    -webkit-animation-delay: 3288ms;
            animation-delay: 3288ms;
}
.meteor:nth-child(4)::before, .meteor:nth-child(4)::after, .meteor:nth-child(4)::after{
    -webkit-animation-delay: 3288ms;
            animation-delay: 3288ms;
}

.meteor:nth-child(5){
    top: calc(50% - 183px);
    left: calc(50% - 8px);
    -webkit-animation-delay: 5588ms;
            animation-delay: 5588ms;
}
.meteor:nth-child(5)::before, .meteor:nth-child(5)::after, .meteor:nth-child(5)::after{
    -webkit-animation-delay: 5588ms;
            animation-delay: 5588ms;
}

.meteor:nth-child(6){
    top: calc(50% - 30px);
    left: calc(50% - 195px);
    -webkit-animation-delay: 9388ms;
            animation-delay: 9388ms;
}
.meteor:nth-child(6)::before, .meteor:nth-child(6)::after, .meteor:nth-child(6)::after{
    -webkit-animation-delay: 9388ms;
            animation-delay: 9388ms;
}

.meteor:nth-child(7){
    top: calc(50% - 95px);
    left: calc(50% - 70px);
    -webkit-animation-delay: 2588ms;
            animation-delay: 2588ms;
}
.meteor:nth-child(7)::before, .meteor:nth-child(7)::after, .meteor:nth-child(7)::after{
    -webkit-animation-delay: 2588ms;
            animation-delay: 2588ms;
}

.meteor:nth-child(8){
    top: calc(50% - 60px);
    left: calc(50% - 70px);
    -webkit-animation-delay: 5288ms;
            animation-delay: 5288ms;
}
.meteor:nth-child(8)::before, .meteor:nth-child(8)::after, .meteor:nth-child(8)::after{
    -webkit-animation-delay: 5288ms;
            animation-delay: 5288ms;
}

.meteor:nth-child(9){
    top: calc(50% - 75px);
    left: calc(50% - 250px);
    -webkit-animation-delay: 888ms;
            animation-delay: 888ms;
}
.meteor:nth-child(9)::before, .meteor:nth-child(9)::after, .meteor:nth-child(9)::after{
    -webkit-animation-delay: 888ms;
            animation-delay: 888ms;
}

.meteor:nth-child(9){
    top: calc(50% - 76px);
    left: calc(50% - 240px);
    -webkit-animation-delay: 2388ms;
            animation-delay: 2388ms;
}
.meteor:nth-child(9)::before, .meteor:nth-child(9)::after, .meteor:nth-child(9)::after{
    -webkit-animation-delay: 2388ms;
            animation-delay: 2388ms;
}

.meteor:nth-child(10){
    top: calc(50% - 85px);
    left: calc(50% - 6px);
    -webkit-animation-delay: 3588ms;
            animation-delay: 3588ms;
}
.meteor:nth-child(10)::before, .meteor:nth-child(10)::after, .meteor:nth-child(10)::after{
    -webkit-animation-delay: 3588ms;
            animation-delay: 3588ms;
}

.meteor:nth-child(11){
    top: calc(50% - 135px);
    left: calc(50% - 260px);
    -webkit-animation-delay: 2888ms;
            animation-delay: 2888ms;
}
.meteor:nth-child(11)::before, .meteor:nth-child(11)::after, .meteor:nth-child(11)::after{
    -webkit-animation-delay: 2888ms;
            animation-delay: 2888ms;
}

.meteor:nth-child(12){
    top: calc(50% - 15px);
    left: calc(50% - 8px);
    -webkit-animation-delay: 388ms;
            animation-delay: 388ms;
}
.meteor:nth-child(12)::before, .meteor:nth-child(12)::after, .meteor:nth-child(12)::after{
    -webkit-animation-delay: 388ms;
            animation-delay: 388ms;
}

.meteor:nth-child(13){
    top: calc(50% - 155px);
    left: calc(50% - 50px);
    -webkit-animation-delay: 7288ms;
            animation-delay: 7288ms;
}
.meteor:nth-child(13)::before, .meteor:nth-child(13)::after, .meteor:nth-child(13)::after{
    -webkit-animation-delay: 7288ms;
            animation-delay: 7288ms;
}

.meteor:nth-child(14){
    top: calc(50% - 28px);
    left: calc(50% - 80px);
    -webkit-animation-delay: 8888ms;
            animation-delay: 8888ms;
}
.meteor:nth-child(14)::before, .meteor:nth-child(14)::after, .meteor:nth-child(14)::after{
    -webkit-animation-delay: 8888ms;
            animation-delay: 8888ms;
}

.meteor:nth-child(15){
    top: calc(50% - 35px);
    left: calc(50% - 200px);
    -webkit-animation-delay: 7588ms;
            animation-delay: 7588ms;
}
.meteor:nth-child(15)::before, .meteor:nth-child(15)::after, .meteor:nth-child(15)::after{
    -webkit-animation-delay: 7588ms;
            animation-delay: 7588ms;
}

.meteor:nth-child(16){
    top: calc(50% - 40px);
    left: calc(50% - 250px);
    -webkit-animation-delay: 1888ms;
            animation-delay: 1888ms;
}
.meteor:nth-child(16)::before, .meteor:nth-child(16)::after, .meteor:nth-child(16)::after{
    -webkit-animation-delay: 1888ms;
            animation-delay: 1888ms;
}


@-webkit-keyframes tail{
    0%{
        width: 0;
    }
    30%{
        width: 100px;
    }
    100%{
        width: 0;
    }
}
@keyframes tail{
    0%{
        width: 0;
    }
    30%{
        width: 100px;
    }
    100%{
        width: 0;
    }
}

@-webkit-keyframes shining{
    0%{
        width: 0;
    }
    50%{
        width: 30px;
    }
    1000%{
        width: 0;
    }
}
@keyframes shining{
    0%{
        width: 0;
    }
    50%{
        width: 30px;
    }
    1000%{
        width: 0;
    }
}

@-webkit-keyframes shooting{
    0%{
        -webkit-transform: translateX(0);
                transform: translateX(0);
    }
    100%{
        -webkit-transform: translateX(300px);
                transform: translateX(300px);
    }
}
@keyframes shooting{
    0%{
       -webkit-transform: translateX(0);
               transform: translateX(0); 
    }
    100%{
        -webkit-transform: translateX(300px);
                transform: translateX(300px);
    }
}

@-webkit-keyframes sky{
    0%{
        -webkit-transform: rotate(45deg);
                transform: rotate(45deg);
    }
    100%{
        -webkit-transform: rotate(405deg);
                transform: rotate(405deg);
    }
}
@keyframes sky{
    0%{
        -webkit-transform: rotate(45deg);
                transform: rotate(45deg);
    }
    100%{
        -webkit-transform: rotate(405deg);
                transform: rotate(405deg);
    }
}

效果动态图：