/* @import url('http://example.com/example_style.css'); */

/***********************************************/
/* CSS @imports must be at the top of the file */
/* Add them above this section                 */
/***********************************************/

/*****************************************/
/* Start your style declarations here    */
/*****************************************/

<style>
  .hs-form_theme-linear .hs-form__field__input {
    font-size: 12px;
}
</style>