After creating this html code for a blue login button:
<div class="p12">
<input type="submit" value="Log In" class="button loginButton">
</div>
I added the following CSS style to it:
.loginButton {
background-color:#627aad;
border:1px solid #556A96;
width:100%;
box-sizing:border-box;
}
The expected appearance should be like this: https://i.sstatic.net/saF66.png
Surprisingly, when viewed on an iPhone using Safari browser, the color of the button changes to silver and ends up looking like this instead: https://i.sstatic.net/9kz4W.png