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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(#141e30, #243b55);
}

.order {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 500px;
    padding: 40px;
    background-color: rgba(0, 0, 0, 0.2);
    box-shadow: 0 15px 25px rgba(0, 0, 0, 0.4);
}

.order h2 {
    color: #fff;
    margin-bottom: 30px;
}

.order .ordr_box {
    position: relative;
    width: 100%;
    height: 70px;
}

.order .ordr_box input {
    outline: none;
    border: none;
    width: 100%;
    padding: 10px 0;
    margin-bottom: 30px;
    color: #fff;
    font-size: 16px;
    border-bottom: 1px solid #fff;
    background-color: transparent;
}

.order .ordr_box label {
    position: absolute;
    top: 0;
    left: 0;
    padding: 10px 0;
    color: #fff;
    /* 点击能动 */
    pointer-events: none;
    transition: all 0.5s;
}

.order .ordr_box div{
    position: relative;
    top: -85px;
    left: 88px;
    color:hsl(0, 100%, 50%);
}
/* valid 判断input是否合法  没有required会被认为合法 */
.order .ordr_box input:focus +label,
.order .ordr_box input:valid +label{
    top: -20px;
    color: #03e9f4;
    font-size: 12px;
}
.order a {
    overflow: hidden;
    position: relative;
    padding: 10px 20px;
    color: #03e9f4;
    text-decoration: none;
    transition: all 0.5s;
}
.order a:hover{
    color: #fff;
    border-radius: 5px;
    background-color: #03e9f4;
    box-shadow: 0 0 5px #03e9f4,0 0 25px #03e9f4, 0 0 50px #03e9f4, 0 0 100px #03e9f4;
}
.order a span{
    position: absolute;
}
.order a span:first-child{
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right,transparent,#03e9f4);
    animation: move1 1s linear infinite;
}
.order a span:nth-child(2){
    right: 0;
    top: -100%;
    width: 2px;
    height: 100%;
    background: linear-gradient(transparent,#03e9f4);
    animation: move2 1s linear 0.25s infinite;

}
.order a span:nth-child(3){
    right: -100%;
    bottom:0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to left,transparent,#03e9f4);
    animation: move3 1s linear 0.5s infinite;

}
.order a span:last-child{
    left: 0;
    bottom: -100%;
    width: 2px;
    height: 100%;
    background: linear-gradient(#03e9f4,transparent);
    animation: move4 1s linear 0.75s infinite;

}
@keyframes move1{
    0%{
        left:-100%;
    }
    50%,100%{
        left:100%;
    }
}
@keyframes move2{
    0%{
        top:-100%;
    }
    50%,100%{
        top:100%;
    }
}
@keyframes move3{
    0%{
        right:-100%;
    }
    50%,100%{
        right:100%;
    }
}
@keyframes move4{
    0%{
        bottom:-100%;
    }
    50%,100%{
        bottom:100%;
    }
}
.tips{
    margin-top: 30px;
    color:hsl(0, 100%, 50%);
}
.tip{
    white-space: normal;
}