.submenu { margin: 0 auto; }

.submenu-appearance-button { list-style-type: none; margin: 0 -.5rem; }
.submenu-appearance-button:not(:last-child) { margin-bottom: 0; }
.submenu-appearance-button > li { display: inline-block; margin: 0 .5rem 1rem .5rem; }

.submenu-align-left { text-align: left; margin-right: auto; }
.submenu-align-center { text-align: center; margin-left: auto; margin-right: auto; }
.submenu-align-right { text-align: right; margin-left: auto; }

/*
.submenu-appearance-button.submenu-align-left { margin-right: auto; }
.submenu-appearance-button.submenu-align-right { margin-left: auto; }
.submenu-appearance-button.submenu-align-center { margin-left: auto; margin-right: auto; }

 */