Webleb - UI Elements - Animated Sign In Form

HTML

CSS

* {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
     font-family: sans-serif;
 }

body {
     display: flex;
     justify-content: center;
     align-items: center;
     min-height: 100vh;
     background: #23242a;
 }

.box {
     position: relative;
     width: 380px;
     height: 420px;
     background: #1c1c1c;
     border-radius: 8px;
     overflow: hidden;
 }

.box::before{
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 380px;
        height: 420px;
    background: linear-gradient(0deg,transparent,transparent,#45f3ff,#45f3ff,#45f3ff);
    z-index: 1;
    transform-origin: bottom right;
    animation: animate 6s linear infinite;
 }
 .box::after{
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 380px;
        height: 420px;
    background: linear-gradient(0deg,transparent,transparent,#45f3ff,#45f3ff,#45f3ff);
    z-index: 1;
    transform-origin: bottom right;
    animation: animate 6s linear infinite;
    animation-delay: 3s;
 }
 .borderline{
    position: absolute;
    top: 0;
    inset: 0;
 }
 .borderline::before{
    content: '';
        position: absolute;
        top: -50%;
        left: -50%;
        width: 380px;
        height: 420px;
        background: linear-gradient(0deg, transparent, transparent, orange, orange, orange);
        z-index: 1;
        transform-origin: bottom right;
        animation: animate 6s linear infinite;
        animation-delay:-1.5s ;
 }
 .borderline::after{
    content: '';
        position: absolute;
        top: -50%;
        left: -50%;
        width: 380px;
        height: 420px;
        background: linear-gradient(0deg, transparent, transparent, orange, orange, orange);
        z-index: 1;
        transform-origin: bottom right;
        animation: animate 6s linear infinite;
        animation-delay:-4.5s ;
 }

@keyframes animate
 {
  0% 
    {transform:rotate(0deg);}
  100% 
    {transform:rotate(360deg);}
 }

.box form{
    position: absolute;
    inset: 4px;
    background: #222;
    padding: 50px 40px;
    border-radius: 8px;
    z-index: 2;
    display: flex;
    flex-direction: column;
 }
 .box form h2{
    color:#fff ;
    font-weight:500 ;
    text-align:center ;
    letter-spacing: 0.1em;
 }
 .box form .inputbox{
    position: relative;
    width: 300px;
    margin-top: 35px;
 }
 .box form .inputbox input{
    position: relative;
    width: 100%;
    padding: 20px 10px 10px;
    background: transparent;
    border: none;
    outline: none;
    box-shadow: none;
    color: white;
    font-size: 1em;
    letter-spacing: 0.05em;
    transition: 0.5s;
    z-index: 10;
 }
 .box form .inputbox span{
    position: absolute;
   left: 0;
   pointer-events: none;
    padding: 20px 0px 10px;
    color:red;
    font-size: 1em;
    letter-spacing: 0.05em;
    transition: 0.5s;
 }
 
 .box form .inputbox input:valid ~ span,
 .box form .inputbox input:focus ~ span{
    color:blue;
    font-size: 0.75em;
 transform: translateY(-34px);
 }
.box form .inputbox i{
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: goldenrod;
    border-radius: 4px;
    overflow: hidden;
    transition: 0.5s;
    pointer-events: none;
}
 .box form .inputbox input:valid~i,
 .box form .inputbox input:valid~i{
    height: 44px;
 }
 .box form .links{
    display: flex;
    justify-content: space-between;
 }
 .box form .links a{
  margin: 10px 0;
  font-size: 0.75em;
  color: green;
  text-decoration: none;
 }
 .box form .links a:hover{
 
  color: rgb(128, 64, 0);

}
 .box form input[type="submit"]
 {
    border: none;
    outline: none;
    padding: 9px 25px;
    background: yellow;
    cursor: pointer;
    font-size:0.9em ;
    font-weight: 600;
    border-radius: 4px;
    width:100px;
    margin-top: 10px;
 }
 .box form input[type="submit"]:active{
    opacity: 0.8;
 }

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