5: Styles

5.1: CSS

In this section, let’s change the user interface so it looks more like a professional app. First, we’ll add some basic styling.

Replace the content of our client/main.css file with the one below, the idea is to have an app bar in the top, and a scrollable content including:

  • form to add new tasks;
  • list of tasks.


body {
  font-family: sans-serif;
  background-color: #315481;
  background-image: linear-gradient(to bottom, #315481, #918e82 100%);
  background-attachment: fixed;

  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;

  padding: 0;
  margin: 0;

  font-size: 14px;

button {
  font-weight: bold;
  font-size: 1em;
  border: none;
  color: white;
  box-shadow: 0 3px 3px rgba(34, 25, 25, 0.4);
  padding: 5px;
  cursor: pointer;

button:focus {
  outline: 0;

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;

.app-header {
  flex-grow: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;

.main {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  overflow: auto;
  background: white;

.main::-webkit-scrollbar {
  width: 0;
  height: 0;
  background: inherit;

header {
  background: #d2edf4;
  background-image: linear-gradient(to bottom, #d0edf5, #e1e5f0 100%);
  padding: 20px 15px 15px 15px;
  position: relative;
  box-shadow: 0 3px 3px rgba(34, 25, 25, 0.4);

.app-bar {
  display: flex;
  justify-content: space-between;

.app-bar h1 {
  font-size: 1.5em;
  margin: 0;
  display: inline-block;
  margin-right: 1em;

.task-form {
  display: flex;
  margin: 16px;

.task-form > input {
  flex-grow: 1;
  box-sizing: border-box;
  padding: 10px 6px;
  background: transparent;
  border: 1px solid #aaa;
  width: 100%;
  font-size: 1em;
  margin-right: 16px;

.task-form > input:focus {
  outline: 0;

.task-form > button {
  min-width: 100px;
  height: 95%;
  background-color: #315481;

.tasks {
  list-style-type: none;
  padding-inline-start: 0;
  padding-left: 16px;
  padding-right: 16px;
  margin-block-start: 0;
  margin-block-end: 0;

.tasks > li {
  display: flex;
  padding: 16px;
  border-bottom: #eee solid 1px;

.tasks > li > span {
  flex-grow: 1;

.tasks > li > button {
  justify-self: flex-end;
  background-color: #ff3046;

If you want to learn more about this stylesheet, check this article about Flexbox, and also this video tutorial by Wes Bos.

Flexbox is an excellent tool to distribute and align elements in your UI.

5.2: Applying styles

Now you need to add some elements around your components. Also, we need to apply our new style to the app using the class attribute. All this work will be done inside the file App.html:



  <template name="mainContainer">
      <div class="app">
              <div class="app-bar">
                  <div class="app-header">
                      <h1>📝️ To Do List</h1>
          <div class="main">
              {{> form }}
              <ul class="tasks">
                  {{#each tasks}}
                      {{> task}}


Your app should look like this:

Review: click here if you want to check how your code should look like.

In the next step, we will make this task list more interactive by filtering tasks.

Edit on GitHub
// search box