Simple Input Box Style

Whenever I browse the web I usually keep my eyes open for interesting styles or style components. Today I found a very nice looking input box; here. Here is my reproduction:

Please type here :

Here is the style for the above text box:

.simple
{
              border-width: 0 0 1px;
              border-style:none none solid;
              background:transparent;
              border-color:black; 
}

Anyway, I like the look of this simple input box and will be using it more.