Is it possible to center text in select box?

There is a partial solution for Chrome:

select { width: 400px; text-align-last:center; }

It does center the selected option, but not the options inside the dropdown.

That's for align right. Try it:

select{
    text-align-last:right;
    padding-right: 29px;
    direction: rtl;
}

the browser support for the text-align-last attribute can be found here: https://www.w3schools.com/cssref/css3_pr_text-align-last.asp It looks like only Safari is still not supporting it.

You have to put the CSS rule into the select class.

Use CSS text-indent

Example

<select class="day"> /* option 1 option 2 option 3 option 4 option 5 here */ </select>

CSS code

select { text-indent: 5px; }