I have div of fixed width containing only input text box and width of that input is set to 100%. I expect it to fill the div but instead it is slightly longer.

Demonstration code:

HTML:

<div class="container">
    <input class="content" id="Text1" type="text" />
</div>

CSS:

.container
{
    width: 300px;
    height: 30px;
    border: thin solid red;
}
.content
{
    width: 100%;
}

Result (Firefox):

enter image description here

This happens also in IE 8, Chrome, Safari... The overflow width seems to vary in different browsers. How do I make the content to exactly fill the width of the div?

html css firefox
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