CSS, overwrite height of all select dropdowns?

100% JS solution (with jquery)

$("select").height("120px");

100% JS solution (without jquery)

var selects = document.getElementsByTagName("select");
for(i = 0;i < selects.length; i++) {
    selects[i].style.height = "120px";
}

100% CSS solution

select {
    height: 100px !important;
}