body {
  background-color: #152640;
  margin: 0;
}

h1 {
  font-size: 30px;
  font-family: Arial;
  margin: 0;
}

p1 {
  font-size: 30px;
  font-family: Arial;
}

.container {
    padding-top: 20px;
    width: 80%;
    margin: auto;
}

.flex {
    display: flex;
    margin: auto;
    justify-content: center;
}

.side {
  margin: 5px;
  margin-bottom: auto;
  padding: 10px;
  border-radius: 10px;
  text-align: center;
  background-color: #f2f2f2;
  width: 25%;
}

.navi {
  margin-bottom: auto;
  padding: 10px;
  border-radius: 10px;
  text-align: center;
  background-color: #e6e6e6;
  font-family: Arial;
}

navi a {
  margin-top: 10px;
  display: block;
  color: #000;
  padding: 8px;
  text-decoration: none;
  background-color: #c4dff3;
  border-radius: 10px;
}

navi a:hover {
  background-color: #7bbceb;
  color: white;
}

.main {
  margin: 5px;
  margin-bottom: auto;
  border-radius: 10px;
  padding: 10px;
  text-align: center;
  background-color: #f2f2f2;
  width: 100%;
}

@media screen and (max-width: 640px) {
  .container {
    width: 100%;
  }
  .flex {
    flex-wrap: wrap;
  }
  .side {
    width: 100%;
  }
}

#zoom {
  transition: transform .2s;
}

#zoom:hover {
  transform: scale(1.05);
}

footer {
  text-align: center;
}