html, body {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}
.bar {
  height: 28px;
  background: #DDD;
  border-bottom: 1px solid gray;
  padding: 4px;
}
.bar > * {
  height: 100%;
  box-sizing: border-box;
  margin-right: 4px;
}
.list {
  height: 0;
  flex-grow: 1;
}
.item {
  font-family: sans-serif;
  font-size: 14px;
  padding: 6px;
}
.item:hover {
  text-decoration: line-through;
  cursor: pointer;
}