how to adjust the width of textfields

trying to enlarge the input field but changing the value doesnt adjust the width ??

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You can adjust your textfields width using custom css, here is a guide:Custom-CSS-Codes

Here is the css code for changing the textarea and textbox, You can adjust the max-width to your preference.

.form-textbox,.form-textarea{
width:300px;
max-width: 300px;
}

Regards.