body {  
    font-family: "Microsoft YaHei", Helvetica, Arial, Lucida Grande, Tahoma, sans-serif;  
    width:100%;  
    height:100%;  
    background: url(https://www.yangxingzhen.com/images/登录背景图.jpg) no-repeat;  
    -moz-background-size: cover;    /*背景图片拉伸以铺满全屏*/  
    -ms-background-size: cover;  
    -webkit-background-size: cover;  
    background-size: cover;  
}  
  
/*顶部的logo*/  
.login h1 a {  
    background:url(https://www.yangxingzhen.com/images/site_logo.png) no-repeat;  
    background-size: 220px 50px;  
    width: 220px;  
    height: 50px;  
    padding: 0;  
    margin: 0 auto 1em;  
    border: none;  
    -webkit-animation: dropIn 1s linear;  
    animation: dropIn 1s linear;  
} 

/*登录框表单*/  
.login form, .login .message {  
    background: #fff;  
    background: rgba(255, 255, 255, 0.3);  
    border-radius: 3px;  
    border: 1px solid #fff;  
    border: 1px solid rgba(255, 255, 255, 0.4);  
    -webkit-animation: fadeIn 1s linear;  
    animation: fadeIn 1s linear;  
}  
  
/*登录框输入框*/  
.login label {  
    color: #000;  
}  
.login .message {  
    color: #000;  
}  
#user_login{  
    font-size: 18px;  
    line-height: 32px;  
}  
  
/* 返回博客与忘记密码链接 */  
#backtoblog a, #nav a {  
    color: #fff !important;  
    display: inline-block;  
    -webkit-animation: rtol 1s linear;  
    animation: rtol 1s linear;  
}  
  
/*掉落的动画效果*/  
@-webkit-keyframes dropIn {  
    0% {  
        -webkit-transform: translate3d(0, -100px, 0)  
    }  
    100% {  
        -webkit-transform: translate3d(0, 0, 0)  
    }  
}  
@keyframes dropIn {  
    0% {  
        transform: translate3d(0, -100px, 0)  
    }  
    100% {  
        transform: translate3d(0, 0, 0)  
    }  
}  
  
/*逐渐出现的动画效果*/  
@-webkit-keyframes fadeIn {  
    from {  
        opacity: 0;  
        -webkit-transform: scale(.8) translateY(20px)  
    }  
    to {  
        opacity: 1;  
        -webkit-transform: scale(1) translateY(0)  
    }  
}  
@keyframes fadeIn {  
    from {  
        opacity: 0;  
        transform: scale(.8) translateY(20px)  
    }  
    to {  
        opacity: 1;  
        transform: scale(1) translateY(0)  
    }  
}  
  
/*从右往左的动画效果*/  
@-webkit-keyframes rtol {  
    from {  
        -webkit-transform: translate(80px, 0)  
    }  
    to {  
        -webkit-transform: translate(0, 0)  
    }  
}  
@keyframes rtol {  
    from {  
        transform: translate(80px, 0)  
    }  
    to {  
        transform: translate(0, 0)  
    }  
}