*, ::before, ::after{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
body{
    font-family: Montserrat, sans-serif;
    background: black;
    height: 80vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
.box{
    width: 500px;
    height: auto;
    padding: 25px;
    background: white;
    border-radius: 3px;
}
.box h3 strong{
    color: black;
    font-weight: 900;
}
.formBloc h3{
    color: cornflowerblue;
    font-size: 28px;
    font-weight: 500;
    margin-bottom: 45px;
}
.formBloc .formGroupe{
    position: relative;
    display: flex;
    margin-bottom: 50px;
}
.formBloc .formGroupe label{
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    color: slateblue;
    font-size: 20px;
    transition: 0.4s ease-out;
}
.formBloc .formGroupe input{
    display: block;
    width: 100%;
    padding: 10px 0px;
    border: none;
    outline: none;
    background: none;
    border-bottom: 3px solid grey;
    color: deepskyblue;
    font-size: 20px;
    transition: 0.4s ease-out;
}
.formGroupe:nth-child(4){
    margin-bottom: 65px;
    justify-content: center;
}
.formBloc .formGroupe .buttonSub{
    display: block;
    width: auto;
    padding: 15px 60px;
    border: fuchsia;
    border-radius: 999px;
    background-image: linear-gradient(to right,transparent 50%, blue 50%, red);
    background-size: 200%;
    color: hotpink;
    font-size: 24px;
    font-weight: 500;
    cursor: pointer;
}
.formBloc .formGroupe .buttonSub:hover{
    color: magenta;
    background-position: 100%;
    border: 3px solid white;
}