ElementUI如何修改el-cascader的默认样式

<el-cascader
    v-model="showOptions"
    style="height: 36px;width:260px"
    placeholder="显示选项"
    :options="optionsList"
    :props="props"
    collapse-tags
    clearable
    popper-class="dropDownPanel"
></el-cascader>

<style>
.dropDownPanel{
    background: #123493;
    border: 1px solid rgba(57,106,254,1);
}
.dropDownPanel[x-placement^=bottom] .popper__arrow {
    display: none;
}
.dropDownPanel .el-cascader-menu {
    color: #fff;
    border-right: 1px solid rgba(57,106,254,1);
}
.dropDownPanel .el-cascader-node.in-active-path {
    color: #38B4C1;
    /* background: transparent; */
}
.dropDownPanel .el-cascader-node.is-active {
    color: #38B4C1;
}
.dropDownPanel .el-cascader-node:not(.is-disabled):focus, 
.dropDownPanel .el-cascader-node:not(.is-disabled):hover {
    background-color: #0C0F56!important;
}
</style>

<style scoped>
/deep/ .el-tag.el-tag--info {
    background-color: #123493;
    border-color: rgba(57,106,254,1);
    color: #FFFFFF;
}
/deep/ .el-cascader__tags .el-tag:not(.is-hit) {
    border-color: rgba(57,106,254,1);
}
</style>

<el-button :style="selfstyle">默认按钮</el-button>
<script>
	export default {
		data() {
			return {
				selfstyle: {
					color: "white",
					marginTop: "10px",
					width: "100px",
					backgroundColor: "cadetblue"
				}
			};
		}
	}
</script>

<el-button :class="[selfbutton]">默认按钮</el-button>
<script>
	export default {
		data() {
			return {
				selfbutton: "self-button"
			};
		}
	}
</script>
<style lang="stylus" rel="stylesheet/stylus" scoped>
	.self-button {
		color: white;
		margin-top: 10px;
		width: 100px;
		background-Color: cadetblue;
	}
</style>

<el-button>和下面的el-button效果一样</el-button>
<el-button :class="[selfbutton]">默认按钮</el-button>
<script>
	import './button.css'
	export default {}
</script>
<style lang="stylus" rel="stylesheet/stylus" scoped></style>
/* button.css */ 
.el-button {
	color: white;
	margin-top: 10px;
	width: 100px;
	background-Color: cadetblue;
}
.self-button {
	color: white;
	margin-top: 10px;
	width: 100px;
	background-Color: cadetblue;
}
.self-button:hover {
	color: black;
	background-Color: whitesmoke;
}
</style>