:root {
  --background-color: rgb(167, 167, 167);
  --itembkg: white;
  --ballY: 0px;
}

body {
  background-color: var(--background-color);
}


.link {
  text-decoration: none;
  color: black;
}

.hide{
  display: none;
}

.item {
  background-color: var(--itembkg);
  border: 1px solid green;
  width: 100%;
  margin: 0 auto;
  padding: 10px;
}

#container {
  margin: 0 auto;
  width: 40%;
}

#exercise1 {
  height: 500px;
}

#soccer {
  margin-top: var(--ballY);
}

.item img {
  display: block;
  margin: 0 auto;
}

#exercise2 img {
  margin: 0
}

#exercise2 p {
  font-weight: bold;
}

#exercise2 ul {
  list-style: none;
  padding: 0px;
}

#exercise2 ul li {
  flex: 1;
}

h1, h3 {
  text-align: center;
}

footer {
  padding: 20px;
  text-align: center;
}


@media (min-width: 700px) {
  .flex {
    display: flex;
  }

  .flex1 {
    flex: 1;
  }

  .item {
    margin: 20px;
    width: 100%;
  }

  nav ul{
    text-align: center;
  }

  #e1::after {
    content: "|";
  }

  nav ul li{
    display: inline-block;
  }
}