Background gradients, migrate from CSS to SCSS, remove !important

client/src/components/Fixed/Fixed.jsx

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+import React from 'react';
+import PropTypes from 'prop-types';
+
+import HeaderContainer from '../../containers/HeaderContainer';
+import ProjectContainer from '../../containers/ProjectContainer';
+
+import styles from './Fixed.module.scss';
+
+const Fixed = ({ projectId }) => (
+  <div className={styles.wrapper}>
+    <HeaderContainer />
+    {projectId && <ProjectContainer />}
+  </div>
+);
+
+Fixed.propTypes = {
+  projectId: PropTypes.string,
+};
+
+Fixed.defaultProps = {
+  projectId: undefined,
+};
+
+export default Fixed;

client/src/components/Fixed/Fixed.module.scss

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+:global(#app) {
+  .wrapper {
+    position: fixed;
+    width: 100%;
+  }
+}

client/src/components/Fixed/index.js

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+import Fixed from './Fixed';
+
+export default Fixed;