.bg-black{
    background-color: rgb(220, 206, 206);
    height: 500px;
    width: 500px;
}
label{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20px;
}
input{
    width: 95%;
    height: 6vh;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
}
.btn{
    display: flex;
    width: 150px;
    margin:0 auto;
    background-color: rgb(255, 102, 102);
    color: white;
    border: 2px solid red;
    cursor: pointer;
}
.invalid{
    border:12px solid red;
}