* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
    scroll-behavior: smooth;
}

body {
  background-color: aliceblue;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  float: left;
  padding: 16px;
  float: left;
  background-color: #FFF;
  border: 1px solid #000;
  margin-top: 100px;
}

button {
  margin-top: 10px;
}