iOS で input type=”button” の見た目を CSS で変更できなくて調べたらところ、
-webkit-appearance: none;この 1 行で解決！
After picking through Safari’s CSS Reference I found -webkit-appearance, which changes the appearance of buttons & controls to resemble a native apple UI. I added this code for comment & search forms to retain the basic style I defined in my CSS: -webkit-appearance:none;