*{
margin: 0;
padding: 0;
box-sizing: border-box;
}

#emge{
    font-size:19px;
    vertical-align:middle;
    text-align: center;
    color:  #555555;
}

img {
object-fit: inherit;
}

a{
line-height:30px;
text-decoration: none;
color:#fff;
}

input,
button,
div {
border-radius: 5px;
}

body {
display: flex;
height: 100vh;
background-image: url(../img/psc.jpg);
background-position: center center;
/*27行*/

/*28行*/
background-repeat: no-repeat;
background-size: cover;
/*当内容高度大于图片高度时 背景图像的位置相对于
viewport 固定
background-attachment: fixed;*/
}

.box {
margin: auto;
}

.login {
padding: 20px 40px;
width: 450px;
height: 395px;
/*41行*/
background-color: rgba(179, 210, 237, 0.7);
}

.nav-conter input:first-child {
margin-top: 55px;
}

.nav-conter input {
margin-top:20px;
height: 40px;
width: 300px;
}

.tab-nav {
display: flex;
justify-content: space-between;
}

.tab-nav a {
position: relative;
font-size:20px;
color:#fff;
}

.tab-nav a: :before {
content:'';
display: block;
width: 0;
height: 3px;
position: absolute;
bottom:-4px;
background-color: #e0e0e0;
border-radius: 2px;
}

.tab-nav a.active: :before {
width: 100%;
left:0;
}

.tab-pane {
/* display： none; */
text-align: center;
margin: 15px auto 0;
width: 300px;
height: 300px;
}

.input-group {
position: relative;
}

.input {
border: solid 2px #d3d3d3;
border-radius: 16px;
background:none;
padding: 16px;
font-size: 16px;
color:#f5f5f5;
transition: border 150ms cubic-bezier(0.4,0,
0.2,1);
}

.user-label {
position: absolute;
left:15px;
top:47px;
color:#f0efef;
pointer-events: none;
transform: translateY(16px);
transition: 150ms cubic-bezier(0.4,0,0.2, 1);
}

.input:focus,
input:valid {
outline: none;
border: 1.5px solid #fff;
}

.input:focus~label,
input:valid~label {
transform: translateY(-50%) scale(0.8);
/*背景颜色*/
/* background-color：#fff；*/
padding: 0 5px;
color：#fff;
}

.tab-pane img {
width: 100%;
height: 100%;
object-fit: cover;
}

.tab-pane span {
cursor: pointer;
display: block;
margin-top: 10px;
}

.login .ures {
margin-top: 6px;
text-align: center;
color：#e0e0e0;
font-size: 16px;
}

.login .ures input {
width:20px;
height:20px;
margin-top: 0;
/*表单与文字对齐 */
vertical-align: middle;
}

.reglogin {
text-align:center;
}

.login button {
margin-left:20px;
margin-top: 10px;
width: 80px;
height: 35px;
border: solid 2px #d3d3d3;
}

.login button:first-child{
margin-left:0;
}