*{
    box-sizing: border-box;
}
body{
    background-color: #f9fafb;
    display:flex;
    align-items:center;
    justify-content: center;
    min-height: 100vh;
    margin : 0px;
}
.container{
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0px 2px 10px rgba(0, 0, 0, .3);
    width: 400px;
}
h2{
    text-align: center;
    margin:0 0 20px ;
}
.form{
    padding: 30px 40px;
}
.form-control{
    margin-bottom: 10px;
    padding-bottom: 10px;
    position: relative;
}
.form-control label{
    color: #777;
    display: block;
    margin-bottom: 5px;
}
.form-control input{
    border: 2px solid #f0f0f0;
    border-radius: 4px;
    display: block;
    width: 100%;
    padding: 10px;
    font-size: 14px;
}
.form-control.success input{
    border-color:green;
}
.form-control.error input{
    border-color: red;
}
.form-control small{
    color: red;
    position: absolute;
    bottom: 1;
    left: 0;
    visibility: hidden;
}
.form-control.error small{
    visibility: visible;
}
.form-button{
    cursor: pointer;
    background-color: #3498db;
    border: 2px solid #3498db;
    color: #fff;
    border-radius: 4px;
    display: block;
    width: 100%;
    padding: 10px;
    margin-top: 20px;
    font-size: 18px;

}