.input-login {
    color: #FFF !important;
}

header {
    background-color: #185ca3 !important;
    color: #FFF !important;
    text-align: center !important;
}

.menu-principal {
    margin-left: 5px !important;
    margin-right: 5px !important;
}

.caja {
    font-size: 1.5em !important;
    color: #2196F3 !important;
}