/* Remove button highlight */
#button-addon2 {
    border: 1px solid #E1E1E1 !important;
    /* keep the original border */
    background-color: white;
    /* keep background */
}

#button-addon2:focus,
#button-addon2:active,
#button-addon2:hover {
    outline: none !important;
    /* remove blue outline */
    box-shadow: none !important;
    /* remove highlight shadow */
}