如何更改CSS中图标的大小？

Question

如何更改图标的大小，我已经下载了适当的大小，但是它仍然很大，我想在选项卡中输入图标，

她有我的密码

<TabView androidTabsPosition="bottom" androidSelectedTabHighlightColor="#2f3e4e" selectedTabTextColor="#2f3e4e">

<StackLayout *tabItem="{ title: 'Lektioner' }">
    <page-router-outlet name="Lessons"> </page-router-outlet>
</StackLayout>

<StackLayout *tabItem="{ title: 'Opgaver', iconSource: 'res://students' }">
    <page-router-outlet name="Assignments"> </page-router-outlet>
</StackLayout>

<StackLayout *tabItem="{ title: 'Elevliste', iconSource: 'res://students' }">
    <page-router-outlet name="Students"> </page-router-outlet>
</StackLayout>