* {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.btn {
    padding: 12px 16px;
    margin: 20px;
    border: none;
    background-color: #0081cb;
    color: white;
    cursor: pointer;
    transition: all 0.6s;
    opacity: 1;
}

.btn:hover {
    opacity: 0.6;
    transition: all 0.6s;
}