css星空效果

<div class="box">
<div class="stars"></div>
</div>

.box{
width: 100%;
height: 700px;
overflow: hidden;
perspective: 340px;/*设置元素被查看位置的视图：*/
position: relative;
background: #000000;
}
.stars {
position: absolute;
top: 50%;
left: 50%;
width: 2px;
height: 2px;
z-index: 1;
box-shadow: -238px 108px #f7f7f7, 193px -376px #f7f7f7, -1264px -60px #fafafa,
145px -443px #c9c9c9, -1440px 37px #f7f7f7, 262px -136px #cfcfcf,
212px 219px #e3e3e3, 319px 223px #c7c7c7, 1246px -51px #c9c9c9,
308px 26px #e0e0e0, 147px 229px #e6e6e6, -1041px 450px #d1d1d1,
671px 86px white, -921px 234px #f0f0f0, -957px 242px #e8e8e8,
1249px -285px #d1d1d1, 741px 434px #d9d9d9, -1030px 330px #ededed,
311px -475px #fcfcfc, -413px -105px #d4d4d4, 868px -435px #f7f7f7,
-790px 289px #dbdbdb, 202px 427px #fcfcfc, -22px -158px #c9c9c9,
-1294px -297px #cccccc, -63px 200px #f0f0f0, -592px -86px #f7f7f7,
-732px 366px white, -1426px -262px #e8e8e8, 475px -400px #c9c9c9,
-1442px -153px #f7f7f7, 1124px -219px #ededed, 701px 257px #f0f0f0,
36px -179px #ebebeb, -937px 480px #f7f7f7, -267px -418px #f2f2f2,
1467px 127px #cfcfcf, -1128px 274px #d1d1d1, -180px 430px #e0e0e0,
624px 275px #fafafa, -473px 150px #e6e6e6, -537px -348px #d4d4d4,
410px 455px #ebebeb, 497px -29px #cccccc, 416px -370px whitesmoke,
977px 82px #c2c2c2, 1209px -222px #f0f0f0, 637px 360px #fcfcfc,
-1049px 409px white, 959px 407px #c9c9c9, -1153px -168px #dedede,
-437px -216px #dbdbdb, -572px 420px #fcfcfc, -228px 78px #dbdbdb,
-925px 452px #cccccc, 244px 30px #c4c4c4, 453px -336px #dedede,
993px -63px #c2c2c2, 670px -343px #d9d9d9, -1088px 344px #fcfcfc,
-170px -153px #c4c4c4, 987px -208px #d1d1d1, 596px 166px #fcfcfc,
-1362px -28px #c4c4c4, 1291px -106px #e3e3e3, -1128px 169px #ededed,
1056px 367px #ebebeb, 261px -128px #cccccc, 1017px 401px #cccccc,
1381px 245px #e3e3e3, 536px -113px #fafafa, -92px -217px #e3e3e3,
1481px 268px #d1d1d1, 832px -345px #cccccc, -863px 138px #f0f0f0,
-997px -412px #e3e3e3, -330px -260px #d9d9d9, 691px -39px #fcfcfc,
-468px -135px #d6d6d6, -535px 405px #e8e8e8, -1289px -284px #e3e3e3,
823px -225px #cccccc, -1172px -348px white, 505px -319px #ededed,
94px -45px #ededed, -687px -64px #c7c7c7, -1133px -456px #f2f2f2,
1357px 135px #e0e0e0, -919px -249px whitesmoke, 206px 32px white,
1453px -338px #cccccc, -764px 83px #e8e8e8, 726px 85px #fafafa,
205px 103px #e3e3e3, 85px 116px #d1d1d1, 1104px -121px #f0f0f0,
649px -304px #dbdbdb, -313px 313px whitesmoke, 491px -419px #c9c9c9,
-1405px 397px #cfcfcf, 30px -81px #e6e6e6;
animation: fly 3s linear infinite;
transform-style: preserve-3d;
}
.stars:before,
.stars:after {
content: "";
position: absolute;
width: inherit;
height: inherit;
box-shadow: inherit;
}
.stars:before {
transform: translateZ(-300px);
}
.stars:after {
transform: translateZ(-600px);
}
@keyframes fly {
from {
transform: translateZ(0px);
}
to {
transform: translateZ(300px);
}
}