html submit css,Center form submit buttons HTML / CSS

Try this :

#btn_s{

width:100px;

}

#btn_i {

width:125px;

}

#formbox {

width:400px;

margin:auto 0;

text-align: center;

}

This has 2 examples, you can use the one that fits best in your situation.

use text-align:center on the parent container, or create a container for this.

if the container has to have a fixed size, use auto left and right margins to center it in the parent container.

note that auto is used with single blocks to center them in the parent space by distrubuting the empty space to the left and right.