a.yellow-contrast {
    color: #3567fd !important;
    background-color: #ffff00 !important;
}
button.yellow-contrast {
    color: #3567fd !important;
    background-color: yellow !important;
}
a.yellow-contrast:hover,
a.yellow-contrast:active,
button.yellow-contrast:hover,
button.yellow-contrast:active,
button.yellow-contrast:focus,
a.yellow-contrast:focus {
    color: #ffff00 !important;
    background-color: #3567fd !important;
    border: 1px solid #ffff00 !important;
}