body{
    margin: 0;
    padding: 0;
    font-family: Futura, sans-serif, Arial;
    position: relative;
    min-height: 100vh;
    height: 100%;
}
body::before{
    content: "";
    position: absolute;
    background-image: url("../Assets/Header_Background.jpg");
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    opacity: 0.4;
    z-index: -2;
}

#body_form{
    margin: auto;
    width: 500px;
    align-items: center;
    justify-content: center;
    padding-bottom: 50px;
}
#form{
    border: solid gray 2px;
    box-shadow: gray 2px 2px 5px;
    width: auto;
    height: auto;
    margin-top: 50px;
    text-align: center;
}
#form .signin{
    line-height: 40px;
    padding: 20px 20px 20px 20px;
}

#e_username{
    display: none;
}
#e_password{
    display: none;
}
#form .error{
    color: red;
}

#error_window{
    padding: 20px;
    border-radius: 10px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0);
    position: fixed;
    z-index: 1001;
    color: white;
}