use ionic light theme code example

Example 1: ionic mobile always dark theme in web

// Change from dark to light. If you have not modified the variable.scss. it should be in line 79.
@media (prefers-color-scheme: dark)

Example 2: ionic color

<ion-button>Default</ion-button>
<ion-button color="primary">Primary</ion-button>
<ion-button color="secondary">Secondary</ion-button>
<ion-button color="tertiary">Tertiary</ion-button>
<ion-button color="success">Success</ion-button>
<ion-button color="warning">Warning</ion-button>
<ion-button color="danger">Danger</ion-button>
<ion-button color="light">Light</ion-button>
<ion-button color="medium">Medium</ion-button>
<ion-button color="dark">Dark</ion-button>