.reserror {
    color: red;
    margin: 10px;
    font-size: 12px;
}
#main {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    padding: 10px;
    border: 2.5px solid black;
    border-radius: 10px;
}
#main input {
    display: block; 
    margin-bottom: 7px;
    border: 1px solid black;
    border-radius: 5px;
    font-size: 20px;
}
#password {
    -webkit-text-security: square;
}
#submit {
    border-radius: 10px;
    border: 2px solid black;
    padding: 10px;
    background-image: radial-gradient(#99ff99, #00ff00);
    cursor: pointer;
    transition: 0.3s;
}
#submit:hover {
    background-image: radial-gradient(#66cc66, #00cc00);
}