h1,h2 {
    text-align: center;
}
body {
    background-color: #87CEEB;
}
div.form {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
form[name="auth"] input[type="submit"] {
    display: block;
    margin: 10px auto;
}
button {
    background-color: #067936;
    border-radius: 10px;
    padding: 10px 20px;
    border: none;
    color: white;
    cursor: pointer;
    margin-top: 10px;
}
input[type=submit] {
    background-color: #f2c464;
}
div.logout, div.login {
    position: absolute;
    right: 2%;
    text-align: center;
}
div.logout button {
    margin-top: -5px;
    background-color: #ff0000;
}
div.login button {
    margin-top: -5px;
    background-color: #176917;
}
div.return {
    display: flex; 
    justify-content: center; 
}
div.return button{
    background-color: chocolate;
}

table {
    border: 1px solid black;
    border-collapse: collapse;
    background: white;
    margin: 0 auto;
}
th {
    background-color: #d3d3d3;
}
th, td {
    border: 1px solid black;
    padding: 5px;
    text-align: center;
}