Use styled radio buttons for theme selection

src/components/views/elements/StyledRadioButton.tsx

@@ -0,0 +1,41 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the 'License');
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an 'AS IS' BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import classnames from 'classnames';
+
+interface IProps extends React.InputHTMLAttributes<HTMLInputElement> {
+}
+
+interface IState {
+}
+
+export default class StyledRadioButton extends React.PureComponent<IProps, IState> {
+
+    public static readonly defaultProps = {
+        className: '',
+    }
+
+    public render() {
+        const { children, className, ...otherProps } = this.props;
+        return <label className={classnames('mx_RadioButton', className)}>
+            <input type='radio' {...otherProps} />
+            {/* Used to render the radio button circle */}
+            <div><div></div></div>
+            <span>{children}</span>
+        </label>
+    }
+}