@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100..900;1,100..900&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Roboto;
  font-size: 1.1rem;
}

main {
  display: flex;
  flex-flow: column;
  align-items: center;
  margin: 50px;
}


nav div.nav-box {
  width: 700px;
  text-align: center;
  white-space: nowrap;
  display: flex;
  justify-content: flex-start;
  column-gap: 20px;
  margin-bottom: 20px;
}

div.nav-box div {
  width: 100px;
  transition: opacity 0.3s;
}

.nav-inactive {
  opacity: 0.3;
}

.nav-active {
  opacity: 1;
  border-bottom: solid 2px black;
  padding-bottom: 5px;
}

.tab-inactive {
  display: none;
}

.tab-active {
  display: flex;
  flex-flow: column;
  align-items: flex-start;
  row-gap: 10px;
  width: 700px;
}

.black-box {
  color: white;
  background-color: black;
  width: 680px;
  height: 150px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 15px;
}