Vue

HTML

<div id="app">
  <div class="navbar">
    Navbar
  </div>
  <div class="sidebar">
    Sidebar with padding-top
    <ul>
      <li draggable v-for="n in items">item {{ n }}</li>
    </ul>
  </div>
  <div class="content">
    <h2>Todos:</h2>
    <ol>
      <li v-for="todo in todos">
        <label>
          <input type="checkbox" v-on:change="toggle(todo)" v-bind:checked="todo.done">

          <del v-if="todo.done">
            {{ todo.text }}
          </del>
          <span v-else>
            {{ todo.text }}
          </span>
        </label>
      </li>
    </ol>
  </div>
</div>

SCSS

$navbarh: 30px;

body {
  background: #20262E;
  font-family: Helvetica;
  overflow: hidden;
}

#app {
  background: #fff;
}

.navbar {
  position: fixed;
  height: $navbarh;
  background-color: lightgreen;
  width: 100%;
  z-index: 2;
}

.sidebar {
  position: fixed;
  width: 80px;
  background-color: lightgray;
  height: 100%;
  padding-top: $navbarh;
  z-index: 1;
  overflow-y: auto;
}

.content {
  background-color: #fff;
  position: absolute;
  padding: 35px 0 0 90px;
  height: 100%;
  width: 100%;
  z-index: 0;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: {
    todos: [
      { text: "Learn JavaScript", done: false },
      { text: "Learn Vue", done: false },
      { text: "Play around in JSFiddle", done: true },
      { text: "Build something awesome", done: true }
    ],
    items: 12
  },
  methods: {
  	toggle: function(todo){
    	todo.done = !todo.done
    }
  }
})