Keep markup minimal and predictable. Use a simple fixed-width container sized for 240px (leave ~8–12px for browser chrome):
This article explains how to obtain and configure the and unlock "extra quality" image rendering on your Java phone. opera mini java 240x320 fixed extra quality
Ensure your phone meets the minimum system requirements: Keep markup minimal and predictable
(QVGA) was the sweet spot for mid-tier feature phones. Opera Mini maximized this limited real estate through Small-Screen Rendering (SSR) opera mini java 240x320 fixed extra quality