CSS3实现页面淡入动画特效代码

    @keyframes fade-in { 
        0% {opacity: 0;}/*初始状态 透明度为0*/ 
        40% {opacity: 0;}/*过渡状态 透明度为0*/ 
        100% {opacity: 1;}/*结束状态 透明度为1*/ 
    } 
    @-webkit-keyframes fade-in {/*针对webkit内核*/ 
        0% {opacity: 0;} 
        40% {opacity: 0;} 
        100% {opacity: 1;} 
    } 
    #wrapper {   
        animation: fade-in;/*动画名称*/ 
        animation-duration: 1.5s;/*动画持续时间*/ 
        -webkit-animation:fade-in 1.5s;/*针对webkit内核*/ 
    } 

    #sidebar {   
        animation: fade-in; 
        animation-duration: 4s; 
        -webkit-animation:fade-in 1.5s; 
    }