Mobile menu on right side?

Hallo, I want to change the position of mobile menu for all devices to right side. Is this possible with some css? I tried some code like

.mobile-menu .mobile-menu-anchor .mobile-menu-text {
  	float: right;
}

and

#mobile-header-menu {
    float: right;
}

but didn't worked for me. I believe someone knows how to ;-) Thanks in advance!