优化工具栏按钮样式

src/sass/ipu/component/toolbar.scss

@@ -45,7 +45,8 @@
    text-align: center;
    white-space: nowrap;
    cursor: pointer;
    padding: .06rem .12rem;
    padding: .06rem;
    min-width: .5rem;
    border-radius: 3px;
    color: $c-toolbar-bg;
    background-color: $c-toolbar-title;