body{
  margin: 0;
}
#container{
  display: flex;
  flex-direction: column;
  height: 100vh;
}
#header{
  display: flex;
  flex-basis: 100px;
  align-items: flex-end;
  padding: 12px;
  background-color: dodgerblue;
  gap: 12px;
}
#header > * {
  background-color: yellow;
  padding: 12px 0;
  text-align: center;
}
#header > *:first-child{
  flex-basis: 100px;
}
#header > *:last-child{
  flex-grow: 1;
}
#main{
  display: flex;
  justify-content: center;
  align-items: center;
  flex-grow: 1;
}
#content{
  padding: 24px;
  background-color: skyblue;
}
#footer{
  flex-basis: 60px;
  background-color: tomato;
}