元素作为容器即可。

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在正文中加入：

创建一个CSS，名字为start

正文：

html, body {

  height: 100%;

  overflow: hidden;

}

 

body {

  background: #000;

  perspective: 340px;

}

 

.stars {

  position: absolute;

  top: 50%;

  left: 50%;

  width: 2px;

  height: 2px;

  box-shadow: -447px 387px #c4c4c4, -401px 118px #fafafa, -109px 217px #d9d9d9, -680px -436px #e3e3e3, 514px 360px #cccccc, -708px 298px #e8e8e8, -696px -270px #ededed, 116px -128px #f7f7f7, 179px 35px white, -404px -90px whitesmoke, -331px -309px #c4c4c4, -363px -24px #d1d1d1, 277px 416px #fafafa, -145px -244px whitesmoke, 123px 62px #d4d4d4, -407px 418px #d9d9d9, 535px 237px #d9d9d9, -466px -78px #f7f7f7, 257px 287px #dedede, 327px -398px #e0e0e0, -602px -38px #c2c2c2, 128px 398px #e6e6e6, 274px -446px #d1d1d1, -602px -298px #c7c7c7, 526px -5px #c4c4c4, -90px -158px #fcfcfc, 5px 294px whitesmoke, -633px 229px #c4c4c4, -475px 427px #dedede, 586px -453px #f2f2f2, 180px -432px #c7c7c7, -637px -88px #cfcfcf, -453px 308px #d6d6d6, -111px 1px #d9d9d9, 573px -450px #ededed, 198px 300px #d6d6d6, -355px 166px #dedede, -715px 13px #e3e3e3, 262px -104px #d1d1d1, 147px 325px #dbdbdb, 1px 399px #dbdbdb, 286px -100px white, 43px -329px #e8e8e8, 617px 55px #d9d9d9, -168px -392px #cccccc, 84px 219px #c9c9c9, 507px -226px #d9d9d9, -327px -70px #e6e6e6, 386px -212px #c4c4c4, -717px 4px #cfcfcf, 502px -231px #e3e3e3, 302px 56px #ededed, 649px 341px #c7c7c7, 569px 350px #c9c9c9, 516px -31px #e6e6e6, 689px 447px #c2c2c2, 591px -206px #fafafa, 422px -137px #e6e6e6, -510px -324px #cccccc, -649px 287px #c2c2c2, -194px -48px #f7f7f7, -279px -329px #d1d1d1, -406px 478px #dbdbdb, -735px -87px #c9c9c9, 30px -197px #dedede, -564px 233px #e6e6e6, -486px -324px #ededed, -54px -7px #ededed, -441px -194px #e3e3e3, -133px -95px #e0e0e0, -722px -73px #d6d6d6, 595px 423px #ededed, 568px -39px #ededed, 370px 377px #d1d1d1, -419px -102px #fcfcfc, -450px 109px #c4c4c4, -57px -119px #d1d1d1, -582px 150px #e6e6e6, 206px -263px #cfcfcf, 582px -461px #c9c9c9, -268px -141px #d9d9d9, -148px 291px #c7c7c7, 254px -179px #c9c9c9, 725px 424px #f0f0f0, 391px -150px #ebebeb, 89px -299px #d4d4d4, 170px 1px #c9c9c9, 243px 209px #c7c7c7, 27px 460px #c9c9c9, -465px -380px #d4d4d4, 530px -360px whitesmoke, -626px 53px #e0e0e0, 706px 218px #d9d9d9, 40px -82px #cccccc, -5px -212px #e6e6e6, -742px 33px #ebebeb, -714px 478px #e0e0e0, -585px -125px #cccccc, -216px 348px #cfcfcf, 601px 332px #ededed, 344px -88px #c4c4c4, 659px -22px #d1d1d1, -411px 188px #d6d6d6, -423px -206px #fcfcfc, -359px -136px #cfcfcf, 612px 406px whitesmoke, 725px 96px whitesmoke, 363px -446px white, -204px 325px #c9c9c9, 740px 176px #fafafa, -489px -352px white, -638px 64px #dbdbdb, 537px -65px #dbdbdb, 151px -32px #ebebeb, 681px 212px #fcfcfc, 604px -149px #e6e6e6, -542px -398px #c4c4c4, -707px 66px whitesmoke, -381px 258px #cfcfcf, -30px 332px #d6d6d6, 512px -381px #c9c9c9, 195px 288px #cccccc, -278px 479px #c7c7c7, 27px -208px #d6d6d6, -288px 15px white, -680px 248px #dedede, 433px 31px #c9c9c9, 150px -206px #d4d4d4, -79px 247px white, -594px 115px #e0e0e0, 99px 292px #e0e0e0, 673px -269px #dedede, -257px -64px #d1d1d1, 449px 81px #f2f2f2, 18px -99px #d1d1d1, -694px 415px #f7f7f7, 240px 264px #e0e0e0, 450px -172px white, 383px 7px #e8e8e8, 338px -73px #c9c9c9, 291px -19px #ebebeb, 659px 137px #d1d1d1, 602px -6px #fcfcfc, 554px 249px #ebebeb, 625px 356px #d9d9d9, 579px -183px #d6d6d6, -20px 250px white, -401px 431px #c4c4c4, -645px -232px #cccccc, -265px -148px white, 553px 258px #d1d1d1, 166px -360px #ebebeb, 719px 51px #ededed, 612px -129px #ebebeb, -465px -104px #f2f2f2, -154px -121px #d9d9d9, -1px 330px #f2f2f2, -666px 248px #f7f7f7, -720px 264px #ededed, 148px -365px #e6e6e6, -388px -349px #c4c4c4, 128px -88px #e3e3e3, -683px -274px #fafafa, -341px 41px #c9c9c9, -59px -471px #f0f0f0, -3px -427px #c2c2c2, 418px 167px #d6d6d6, 343px 247px #c7c7c7, 623px -347px #d1d1d1, 716px -217px white, 243px -409px whitesmoke, -75px -126px #d6d6d6, -730px -91px #c9c9c9, -210px -397px #cfcfcf, -349px 180px #c9c9c9, -567px -281px #e0e0e0, -460px 381px #fcfcfc, -310px -22px #ededed, 450px -1px #dbdbdb, -405px -328px #e3e3e3, 5px 332px #d6d6d6, -294px 302px #fcfcfc, -398px 97px whitesmoke, -696px 325px #cfcfcf, -589px 110px #d6d6d6, 353px -411px #dbdbdb, -697px -318px #ebebeb, -114px -72px #f0f0f0, 259px -193px #fcfcfc, 60px 26px #e6e6e6, -63px -232px white, 205px -372px #f7f7f7, -464px -333px #f2f2f2, -374px 123px white, -377px -386px #c7c7c7, -80px 337px #cccccc, 478px -178px #dbdbdb, 222px 420px #ebebeb, -707px 99px #c4c4c4, 716px -132px #fafafa, -253px -286px #e3e3e3, 646px 178px #f0f0f0, 201px 24px #d1d1d1, 178px -58px #c7c7c7, -557px 368px #ededed, 0px 219px #d9d9d9, -266px -269px #cccccc, 242px -197px #c9c9c9, -419px 193px #c2c2c2, -47px 91px #c7c7c7, -109px 75px #c2c2c2, -146px -453px #d6d6d6, 671px -350px #f2f2f2, 421px -91px #d9d9d9, 738px 19px #ededed, -316px -155px #dedede, 419px 244px #fcfcfc, -278px -418px #d6d6d6, -581px -181px #fcfcfc, 139px 264px #d9d9d9, 691px -11px #ebebeb, -622px 402px #c2c2c2, 219px 396px #f0f0f0, -149px -423px white, -716px -78px #d9d9d9, -590px 341px #e6e6e6, -208px 79px #d6d6d6, -227px -24px #f7f7f7, 239px 262px #d1d1d1, 740px 443px #f7f7f7, 509px 134px #d6d6d6, -555px 232px #e8e8e8, -67px -427px #cfcfcf, -368px 250px #f7f7f7, 715px -415px #fafafa, 411px -301px #f0f0f0, -322px 287px #d9d9d9, -429px -90px #f2f2f2, -327px -387px #f0f0f0, -491px 183px #c2c2c2, -133px 250px #d4d4d4, 538px 139px #e3e3e3, -417px -125px #f0f0f0, 653px -351px #e6e6e6, -549px 38px #d4d4d4, 602px 110px whitesmoke, 415px 105px #e0e0e0, -733px -371px #cfcfcf, 286px 403px #d4d4d4, 11px 320px #c4c4c4, -597px 158px whitesmoke, 716px -350px whitesmoke, 321px 67px #fafafa, -237px -300px #cfcfcf, 74px 152px #c9c9c9, 587px -123px #fcfcfc, 699px -332px whitesmoke, 399px 355px #f7f7f7, -323px 314px #dbdbdb, 89px 416px #c7c7c7, 445px 38px #e3e3e3, 572px 122px #c4c4c4, -258px 372px white, 49px 306px #d9d9d9, 437px -35px #dedede, 566px 174px #f2f2f2, 732px -299px whitesmoke, -410px 394px #ededed, 131px -415px white, 19px -326px #e8e8e8, -700px -188px #d1d1d1, 96px -1px #e0e0e0, -328px -396px #f0f0f0, -117px -214px #fcfcfc, -53px 261px #ebebeb, 80px 134px #d6d6d6, -364px -216px white, -636px -125px #dbdbdb, -639px -265px #e3e3e3, 208px 98px #c7c7c7, 172px 467px #e0e0e0, 435px 309px #e3e3e3, 194px -259px #f0f0f0, 209px -186px #c9c9c9, -312px 418px #fafafa, 229px 407px #c9c9c9, -449px -357px #fafafa, 674px 121px #e8e8e8, 608px -429px #ebebeb, -431px -428px #cfcfcf, 105px 462px #e3e3e3, -179px -372px #e3e3e3, 143px -317px #d6d6d6, -449px -149px #fafafa, -544px 250px #dedede, -220px -323px whitesmoke, 658px 8px whitesmoke, -656px -244px #e8e8e8, 347px 11px whitesmoke, 694px -230px #f7f7f7, -317px 1px #c4c4c4, 28px 23px #fcfcfc, -382px 321px #dbdbdb, 632px -74px #c4c4c4, 154px -245px #c2c2c2, -553px 337px #d6d6d6, -48px -243px #d1d1d1, 92px -391px #cccccc, -71px -256px #cfcfcf, -372px 57px #d9d9d9, 369px -140px #fcfcfc, 675px 81px #c2c2c2, -663px 254px #cccccc, 703px -203px #ededed, 74px -363px #c2c2c2, 643px -458px #d1d1d1, 198px 359px #cccccc, 265px 309px #d4d4d4, -353px -368px #e8e8e8, -465px 439px whitesmoke, 693px 360px #c9c9c9, 634px -397px #d1d1d1, 467px 25px whitesmoke, -558px -272px #e6e6e6, 671px 69px #dbdbdb, 407px 357px #cfcfcf, 379px 80px white, 10px -203px #c9c9c9, 104px -292px #f0f0f0, -667px -29px #d1d1d1, 557px -155px #e6e6e6, -505px 115px #cfcfcf, -605px 164px #f2f2f2, -108px -223px #e0e0e0, 523px -156px #ebebeb, 691px 230px white, -507px -13px #d1d1d1, -349px 332px #dedede, 520px 266px whitesmoke, -66px -250px #e6e6e6, -496px -449px #ebebeb, 414px -170px #dedede, -649px 230px #ebebeb, 598px -92px #c7c7c7, -638px 113px #c2c2c2, 151px 363px #f7f7f7, -445px -241px #f0f0f0, 527px -14px #dedede, 203px -61px #cfcfcf, -716px -284px #ebebeb, -525px 134px #c2c2c2;

  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);

  opacity: .6;

}

.stars:after {

  transform: translateZ(-600px);

  opacity: .4;

}

 

@keyframes fly {

  from {

    transform: translateZ(0px);

    opacity: .6;

  }

  to {

    transform: translateZ(300px);

    opacity: 1;

  }

}

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