* {
  box-sizing: border-box;
  margin: 0 auto;
}

header {
  background-color: grey;
  color: white;
  text-align: left;
  padding: 10px;
}

.container {
  display: flex;
  flex-direction: row;
}

.container > div:nth-child(-n+3), /* -n (decreasing seq from zero), (+3 is starting point for n) */
.container > div:nth-child(-n+3) button {
  font-size: 1.5cqw;
  flex: 1 1 auto;
  border-radius: 15px;
  width: 100%;
}

.content {
  display: flex;
}

#projects,
#tools {
  flex: 1 1 0;
  list-style-type: "- ";
  margin: 5px;
}

footer {
  background-color: grey;
  color: white;
  text-align: center;
  padding: 10px;
}