body {
    background: linear-gradient(135deg, #2F4F4F, #5E8C61);
    /*background: linear-gradient(135deg, #2F4F4F, #66bb6a);*/
    /*background: linear-gradient(135deg, #2F4F4F, #1B3D2F);*/
    /*background: linear-gradient(135deg, #2F4F4F, #388e3c);*/
    background-attachment: fixed;
    font-family: 'Segoe UI', sans-serif;
}

.card {
    background-color: rgba(255, 255, 255, 0.95);
}