HTML input textbox with a width of 100% overflows table cells

Question

Does anyone know why the input elements with a width of 100% go over the table\'s cells border.

In the simple example below input box go over the table\'s cells border,

Answer 1

I solved the problem by using this

tr td input[type=text] {
  width: 100%;
  box-sizing: border-box;
  -webkit-box-sizing:border-box;
  -moz-box-sizing: border-box;
  background:transparent !important;
  border: 0px;
}