#前端学习问题#表格居中 背景缩小后不变形

表格居中

.login-wrapper{
  margin: 0  auto;
  position: absolute;
  left: 50%;
  top: 50%;
}

　　

背景固定

body {

    background-image: linear-gradient(to right , #7A88FF,#99CCCC);
    background-position: center 0;
    background-repeat: no-repeat;
    background-attachment:fixed;
    background-size: cover;
    -webkit-background-size: cover;/* 兼容Webkit内核浏览器如Chrome和Safari */
     -o-background-size: cover;/* 兼容Opera */
    zoom: 1; 
}