style.css

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    user-select: none;
}
:root{
    --primary:orange;
}
body{
    background: #303030;
    font-family:Raleway;
}
.submit{
    display:flex;
    min-height:100vh;
    justify-content: center;
    align-items: center;
    padding:1rem;
}
form{
    display:flex;
    flex-direction: column;
    width:max(340px, 35vh);
    background:#474545;
    padding: 2.5rem 1.5rem;
    border-radius: 1rem;
}
.input_section{
    display:flex;
    flex-direction:column;
}
button,input[type="button"]{
    font-family:Raleway;
    cursor:pointer;
    padding:.5rem;
    font-size:1rem;
    font-weight:800;
    border:2px solid var(--primary);
    background:linear-gradient(to right, orange 50%, rgba(0,0,0,0) 50%);
    background-size: 250%;
    background-position: right;
    margin:1rem 0;
    color: var(--primary);
    border-radius: 5px;
    transition: .5s ease background-position;
}
button:hover, input[type="button"]:hover{
    background-position: left;
    color:#303030;
}
input{
    padding: .25rem .5rem;
    border:0;
    background:transparent;
    position:relative;
    outline:none;
    color:white;
    font-size: 1rem;
}
form div{
    position: relative;
    margin:.4rem 0 ;
    padding:.3rem 0;
}
form div::before, form div::after{
    content:'';
    position:absolute;
    width: 100%;
    height: 2px;
    background-color: #ccc;
    bottom:0;
}
form div::after{
    transform: rotateY(90deg);
    background-color: var(--primary);
    transition:.3s ease-in;
}
label{
    color:white;
    transform: translateY(1.3rem);
    height:1rem;
    transition:.4s ease;
    margin-bottom: .3rem;
}
.section_focused label{
    color : var(--primary);
    transform: none;
    font-size:.87rem;
}
.section_focused::after{
    transform: none;
}
p,a{
    color:white;
}