Small changes to address code review feedback

Author: KoolADE85

components/dash-core-components/src/components/Input.react.js

@@ -66,7 +66,7 @@ export default class Input extends PureComponent {
                 data-dash-is-loading={
                     (loading_state && loading_state.is_loading) || undefined
                 }
-                className={`dash-input ${this.props.className || ''}`}
+                className={['dash-input', this.props.className].join(' ')}
                 ref={this.input}
                 onBlur={this.onBlur}
                 onChange={this.onChange}

components/dash-core-components/src/components/css/input.css

@@ -4,4 +4,4 @@ input.dash-input:invalid {
 
 input.dash-input:valid {
     outline: none black;
-}
+}

components/dash-core-components/tests/integration/input/test_input_basics.py

@@ -1,6 +1,5 @@
 import pytest
 from selenium.common.exceptions import WebDriverException
-from selenium.webdriver.common.by import By
 from dash import Dash, Input, Output, dcc, html
 
 
@@ -97,8 +96,8 @@ def test_inbs003_styles_are_scoped(dash_dcc):
 
     dash_dcc.start_server(app)
 
-    external_input = dash_dcc.driver.find_element(By.ID, "ExternalInput")
-    dash_input = dash_dcc.driver.find_element(By.CLASS_NAME, "unittest")
+    external_input = dash_dcc.find_element("#ExternalInput")
+    dash_input = dash_dcc.find_element(".unittest")
 
     external_outline_css = external_input.value_of_css_property("outline")
     dash_outline_css = dash_input.value_of_css_property("outline")