index.css

/* Dropdown Button */
.dropbtn {
  background-color: #015436;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {background-color: #ddd;}

.dropdown:hover .dropdown-content {display: block;}

.dropdown:hover .dropbtn {background-color: #3e8e41;}


body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  transition: background-color, 0.8s;
}
.main {
  display: flex;
  min-height: 100vh;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.container {
  display: flex;
  padding: 3em 0;
}

.radio-container {
  display: flex;
  font-size: 22px;
  padding: 0 1em;
}
button {
  border: none;
  color: white;
  padding: 16px 32px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  opacity: 0.6;
  transition: 0.3s;
  display: inline-block;
  text-decoration: none;
  cursor: pointer;
}

button:hover {opacity: 1}

.main > h1 {
  text-transform: uppercase;
  font-size: 1.6rem;
}
#summer {
  border:3px solid #c8d2d1;
  color: #ee9b01;
  background-color: #f4511e
}
#winter {
  border:3px solid #1f4b8e;
  color: #1f4b8e;
  background-color: #B1B2FF
}

#autumn {
  border:3px solid #606c38;
  color: #283618;
  background-color:#F7A76C
}

#spring {
  border:3px solid #fe98ab;
  color: #00b5a1;
  background-color: #F94892
}
@media screen and (min-width: 700px) {
  .main > h1 {
    font-size: 3rem;
  }

  .radio-container {
    padding: 0 2em;
  }