* {
  font-family: 'Tahoma', sans-serif;
}
body {
  margin: 0;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}
header {
  color: #FFFFFF;
  background-color: #17A2B8;
}
main {
  display: flex;
  flex: 1;
}