body {
  margin: 0;
}

header {
  height: 40px;
  border-bottom: solid 2px #929292;
  margin: 0 5px;
  width: calc(100% - 10px);
  display: flex;
  align-items: center;
}
header h1 {
  font-size: 1.5rem;
  margin: 0;
  font-family: cursive;
  position: relative;
  padding-left: 10px;
}
header h1::before {
  content: "";
  position: absolute;
  height: 100%;
  width: 5px;
  left: 0;
  top: 0;
  background-color: teal;
}
header button {
  background-color: cornflowerblue;
  color: #fff;
  outline: none;
  border: none;
  border-radius: 0.5rem;
  width: 70px;
  height: 30px;
  font-weight: bold;
  margin-left: auto;
}

main {
  height: calc(100vh - 50px);
}

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