@import url('https://fonts.gogleapis.com/css2? family=Quicksand:wght@300;400;500;600;700& display=swap');
*{
   margin:0; 
   padding: 0;
   box-sizing: border-box;
   font-family: 'Quicksand',sans-serif;
}
body{
    display: flex; 
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color:#000;
}
section{
    position: absolute;
    width: 100vw;
    height: 100vh;
    display: flex; 
    justify-content: center;
    align-items: center;
    gap: 2px;
    flex-wrap: wrap;
    overflow: hidden;
}
section::before{
    content: '';
    position: absolute;
    width:100% ;
    height: 100%;
    background: linear-gradient(#ffff00,#9900ff,#0000ff,#33ffcc);
    animation: animate 5s linear infinite;
}
@keyframes animate
{
 0%
{
transform: translateY(-100%)
}
100%
{
transform: translateY(100%)
}
}
section span
{
    position: relative;
    display: block;
    width: calc(6.25vw - 2px);
    height: calc(6.25vw - 2px);
    background: #181818;
    z-index:2;
    transition:1.5s;
}
section span:hover
{
    background: blue;
    transition:0s;
}
section .signin{
   position: absolute;
   width: 400px;
   background: #222;
   z-index: 1000;
   display: flex;
   justify-content: center;
   align-items: center;
   padding: 40px;
   border-radius: 4px;
   box-shadow: 0 15px 35px rgba(0, 0,0,0.5);
}
section .signin .content{
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 40px;
}
section .signin .content h2{
    font-size: 2em;
    color: #0066ff;
    text-transform: uppercase;
}
section .signin .content .form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 25px;
}
section .signin .content .form .inputBx{
    position: relative;
    width: 100%;
}
section .signin .content .form .inputBx input{
    position: relative;
    width: 100%;

    background: #333;
    border: none;
    outline: none;
    padding: 25px 10px 7.5px;
    border-radius: 4px;
    color: #fff;
    font-weight: 500;
    font-size: 1em;
}
section .signin .content .form .inputBx i{
position: absolute;
left: 0;
padding: 7px 10px;
font-style: normal;
color: #aaa;
transition: 0.5s;
pointer-events: none;
}
.signin .content .form .inputBx input :focus ~ i
.signin .content .form .inputBx input :valid ~ i
{ 
transform: translateY(-77.5px);
font-size: 8em;
color: #fff;
}
.signin .content .form .links {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: space-between;
}
.signin .content .form .links a {
color: #fff;
text-decoration: none;
}
.signin .content .form .links a {
    color: #0066ff;
    font-weight: 600;
}
.signin .content .form .inputBx input[type="submit"]{
    padding: 10px;
    background: #0066ff;
    color: #fff;
    font-weight: 600;
    font-size: 1.25em;
    letter-spacing: 0.05em;
    cursor: pointer;
}
@media (max-width:900px){
    section span
    {
    width: calc(10vw - 2px);
    height: calc(10vw - 2px);
    }
}
@media (max-width:600px){
    section span
    {
    width: calc(20vw - 2px);
    height: calc(20vw - 2px);
    }
}