This should be working also.
-webkit-appearance:default-button;
There are quite a few parameters for this property that you may want to take advantage of and/or watch out for. Also, If you simply wanted to disable inner-shadows of input fields you could just use -webkit-appearance:caret;.
button
button-bevel
caret
checkbox
default-button
listbox
listitem
media-fullscreen-button
media-mute-button
media-play-button
media-seek-back-button
media-seek-forward-button
media-slider
media-sliderthumb
menulist
menulist-button
menulist-text
menulist-textfield
none
push-button
radio
searchfield
searchfield-cancel-button
searchfield-decoration
searchfield-results-button
searchfield-results-decoration
slider-horizontal
slider-vertical
sliderthumb-horizontal
sliderthumb-vertical
square-button
textarea
textfield
height
attribute:<input type="submit" value="Send" style="background: #eee; height: 50px;"/>
– Culp