Start with default generated template

css/components/exposed-filters.css

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+/**
+ * @file
+ * Visual styles for exposed filters.
+ */
+
+.exposed-filters .filters {
+  float: left; /* LTR */
+  margin-right: 1em; /* LTR */
+}
+[dir="rtl"] .exposed-filters .filters {
+  float: right;
+  margin-right: 0;
+  margin-left: 1em;
+}
+.exposed-filters .form-item {
+  margin: 0 0 0.1em 0;
+  padding: 0;
+}
+.exposed-filters .form-item label {
+  float: left; /* LTR */
+  width: 10em;
+  font-weight: normal;
+}
+[dir="rtl"] .exposed-filters .form-item label {
+  float: right;
+}
+.exposed-filters .form-select {
+  width: 14em;
+}
+/* Current filters */
+.exposed-filters .current-filters {
+  margin-bottom: 1em;
+}
+.exposed-filters .current-filters .placeholder {
+  font-weight: bold;
+  font-style: normal;
+}
+.exposed-filters .additional-filters {
+  float: left; /* LTR */
+  margin-right: 1em; /* LTR */
+}
+[dir="rtl"] .exposed-filters .additional-filters {
+  float: right;
+  margin-right: 0;
+  margin-left: 1em;
+}