如何使用纯CSS实现Windows启动界面的动画效果

1、如何使用纯css实现windows启动界面的动画效果源代码下载代码解读定义dom，容器中包含2个元素，分离代表logo和进度条，logo又包含3段文字：microsoftwindowsprofessional居中显示：bodymargin:0;height:100vh;display:flex;align-items:center;justify-content:center;background-color:black;定义容器尺寸：.windows-bootwidth:21.5em;height:15em;设置段落样式：.logopcolor:white;font-family:sans-

2、serif;margin:0;padding:0;设置字号：.logo.msfont-size:1.6em;.logo.winfont-size:4.2em;.font-size:3em;设置字体粗细：.logo.msfont-weight:lighter;.logo.winfont-weight:bold;.font-weight:lighter;设置行高：.logo.msline-height:1em;.logo.winline-height:86%;.line-height:1em;padding-left:0.2em;在&quot

3、;microsoft"后面增强商标版权符号：.logo.ms:aftercontent:&39;00a9&39;font-size:0.625em;vertical-align:top;position:relative;top:-0.3em;left:0.2em;在"windows"后面增强"xp"：.logo.win:aftercontent:&39;xp&39;font-size:0.5em;vertical-align:top;position:relative;t

4、op:-0.4em;color:tomato;定义进度条尺寸：.barwidth:15em;height:1em;border:0.2emsolidsilver;增强logo和进度条的间距：.windows-xp-loaderdisplay:flex;flex-direction:column;justify-content:space-between;align-items:center;设置进度条的样式：.barborder-radius:0.7em;position:relative;padding:0.2em;.bar:beforecontent:&39;&39;pos

5、ition:absolute;width:3em;height:70%;background-color:dodgerblue;border-radius:0.2em;用线性渐变设置进度条中蓝色色块的样式：.bar:beforebackground:linear-gradient(toright,transparent30%,black30%,black35%,transparent35%,transparent65%,black65%,black70%,transparent70%),linear-gradient(blue0%,royalblue17%,deepskyblue32%,deepskyblue45%,royalblue60%,blue100%);filter:brightness(1.2);增强动画效果：.bar:beforeanimation:run2slinearinfinite;keyframesrunfromtransform:translatex(-3em)