input[type="submit"]::-moz-focus-inner {
    border: 0;
}

input[type="submit"], input[type="text"] {
    line-height:normal !important;
}
html:

<form method="post" id="search" action="">
    <p><input type="text" name="input-1"><input type="submit" value="Submit"></p>
</form>

http://stackoverflow.com/questions/4483279/make-form-button-text-field-same-height-in-all-browsers

taken from StackOverflow

Equal Height Text field and Button

CSS