Issue on theme color changing of horizontal layout

[vxfranky]

• I have searched the issues of this repository and believe that this is not a duplicate.

Antdv version 1.7.8 (udpated)

What problem does this feature solve?

Horizontal layout using tag <a-layout-header> which has no attribute to change its theme color, the color was fixed to @layout-header-background: #001529 (defined at: node_modules/ant-design-vue/lib/style/themes/default.less). It is possible to change the background color by setting background-color to a specified value according to the value of theme, but the color change was instant, while <a-menu> has an animation.

What does the proposed API look like?

<a-layout
id="components-layout-demo-fixed"
v-if="navMode == 'horizontal'"

<a-layout-header
:style="{
position: 'fixed',
zIndex: 1,
width: '100%',
}"

Ant Design of Vue

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