How to isolate individual input="text" to modify size of input box

Well, I have a bunch of input=”text” type interfaces for a form and I need to modify one of them specifically which will have more words.

I tried to use class but that doesn’t seem to work. I also tried adding width directly to the

[CODE]
// small
input[type=”text”] {
width: 300px;
height: 30px;
vertical-align: top;
}
// big
input[type=”text”] {
width: 300px;
height: 300px;
vertical-align: top;
}
<input type=”text” name=”computer-model”> // this one normal
<input type=”text” name=”description-of-problem”> // this one big
[/CODE]

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