按钮大小

大小按钮引导程序的类是:

.btn-lg
.btn-md
.btn-sm
.btn-xs

StackOverflow 文档

例如 :

<button type="button" class="btn btn-primary btn-lg">Large</button>
<button type="button" class="btn btn-primary btn-md">Medium</button>
<button type="button" class="btn btn-primary btn-sm">Small</button>
<button type="button" class="btn btn-primary btn-xs">XSmall</button>