Make select element consistent across browsers

Hopefully..

Fixes #103

src/sass/inputs.scss

@@ -31,6 +31,7 @@ input[type="text"] {
 select {
     height: 20px;
     padding: 0 2px;
+    line-height: 1;
 }
 
 input[type="date"]::-webkit-inner-spin-button {