you could make a class for it
input.register {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10px;
color: #3F3F3F;
border: 1px outset #0066CC;
background-color: #F3F5F5;
}
<input name="phone" type="text" class="register" id="phone" />
<signature>
sometime you just gotta say "WHAT THE @#*% !!"
</signature>