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;
CSS Webkit Appearance | Trent Walton
今まで困ったことなかったんだけど、なんでかな？と思ったら normalize.css に関連の記述がありました！
/**
* 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
* and `video` controls.
* 2. Correct inability to style clickable `input` types in iOS.
* 3. Improve usability and consistency of cursor style between image-type
* `input` and others.
*/
button,
html input[type="button"], /* 1 */
input[type="reset"],
input[type="submit"] {
-webkit-appearance: button; /* 2 */
cursor: pointer; /* 3 */
}/**
* 1. Address `appearance` set to `searchfield` in Safari and Chrome.
* 2. Address `box-sizing` set to `border-box` in Safari and Chrome
* (include `-moz` to future-proof).
*/
input[type="search"] {
-webkit-appearance: textfield; /* 1 */
-moz-box-sizing: content-box;
-webkit-box-sizing: content-box; /* 2 */
box-sizing: content-box;
}/**
* Remove inner padding and search cancel button in Safari and Chrome on OS X.
* Safari (but not Chrome) clips the cancel button when the search input has
* padding (and `textfield` appearance).
*/
input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}以上、normalize.css v3.0.1 より。