I have added CSS style to the submission button form my web form. However, while it looks as I hoped it would on my laptop – I tried both Safari and Chrome and the button appeared the same – the mobile button is not properly shaped and not colored correctly.
Relevant HTML:
<html>
<body>
<form action="{{ post somewhere }}" method="post">
  <strong>+1</strong><input name="number-form" placeholder="4045553829" id="number-input" maxlength="10" type="text" onkeypress="return onlyNumbers()"></input>
  <input type=submit value="verify number" class="submit-button"></input>
</form>
  </body>
  </html>
Corresponding CSS:
body {
    background-color: #fff;
    display: block;
    position: absolute;
    height: auto;
    width: auto;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    margin-top: 0px;
    margin-right: 0px;
    margin-bottom: 100px;
    margin-left: 0px;
}
form {
    width: 650px;
    margin-left: auto;
    margin-right: auto;
}
strong {
    font-family: 'Open Sans', sans-serif;
    font-weight: 600;
    font-size: 2em;
    padding-right: 10px;
}
input, #number-input, #veriform {
    font-family: 'Open Sans', sans-serif;
    font-weight: 600;
    font-size: 2.5em;
    color: #181818;
}
#number-input {
    width: 260px;
    padding-left: 10px;
    padding-right: 10px;
    border: 1px solid #a8a8a8;
}
.submit-button {
    background-color: #8a50c9;
    color: #fff;
    margin-left: 10px;
    padding-left: 20px;
    padding-right: 20px;
    border: none;
}
I have created a JSFiddle – at http://jsfiddle.net/rpE3w/1/ – so it can be viewed in browser.
While on a PC the button is a solid-purple rectangle with white lettering, viewing it on a mobile browser seems to yield a rounded, gradient button.
Many thanks in advance.
 
     
     
    