body {
    text-align: center;
    margin: auto;
    width: 80%;
    font-family: 'Calibri', 'Segoe UI', 'Tahoma', Geneva, Verdana, sans-serif;
    background-color: #f0f0f0;
    color: #333;
}
header {
    color: aliceblue;
    background-color: blueviolet;
    border: 2px darkblue solid;
    margin: 0.5em auto;
    padding: 20px;
    text-align: center;
}
main {
    margin-top: 20px;
}
footer {
    margin-top: 40px;
    text-align: center;
    font-size: 0.9em;
    color: #666;
}
button {
    font-family: inherit;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
    border-radius: 4px;
}
button.mybtn {
    background-color: #007BFF;
    color: white;
}
button.mybtn:hover {
    background-color: #0056b3;
    color: #E0E0E0;
}
input {
    font-family: inherit;
}