Add filter to Shopify collection page

collections.liquid

<div class="custom-filter-div">
				<label for="custom-filter-by">Filter By</label>
				<select name="custom-filter-by" class="custom-filter-by" style="width: 100%; font-size: 15px; line-height: 15px; cursor: pointer; background: #ededed; text-align: left; -webkit-appearance: none; padding: 10px 50px 10px 20px; border-radius: 0; border: 0;">
			    	<option value="">{{ 'collections.filtering.all' | t }}</option>
				    {% for tag in collection.all_tags %}
					    {% if current_tags contains tag %}
					    	<option value="{{ tag | handle }}" selected>{{ tag }}</option>
					    {% else %}
					    	<option value="{{ tag | handle }}">{{ tag }}</option>
					    {% endif %}
				    {% endfor %}
				</select>

			
				<label for="custom-sort-by">Sort By</label>
				<select name="custom-sort-by" id="custom-sort-by" style="width: 100%; font-size: 15px; line-height: 15px; cursor: pointer; background: #ededed; text-align: left; -webkit-appearance: none; padding: 10px 50px 10px 20px; border-radius: 0; border: 0;">
					<option value="manual">{{ 'collections.sorting.featured' | t }}</option>
					<option value="best-selling">{{ 'collections.sorting.best_selling' | t }}</option>
					<option value="title-ascending">{{ 'collections.sorting.az' | t }}</option>
					<option value="title-descending">{{ 'collections.sorting.za' | t }}</option>
					<option value="price-ascending">{{ 'collections.sorting.price_ascending' | t }}</option>
					<option value="price-descending">{{ 'collections.sorting.price_descending' | t }}</option>
					<option value="created-descending">{{ 'collections.sorting.date_descending' | t }}</option>
					<option value="created-ascending">{{ 'collections.sorting.date_ascending' | t }}</option>
				</select>

			<button id="apply-sort-filter" class="button" style="margin-right: 10px;">{{ 'sidebar.collection_filters.submit' | t }}</button>

			<!--<button id="clear-sort-filter" class="button">{{ 'sidebar.collection_filters.clear' | t }}</button>-->
    </div>