.banner {
  min-width: 100%;
  min-height: 60%;
  max-height: 300px;
  background-image: url("../images/echidna-banner.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}

.img {
  margin: 10px;
  width: 200px;
  border-radius: 15px;
  box-shadow: 0 2px 10px var(--dark-grey)
}

.h2 {
  margin: 0;
  text-align: center;
}

.el {
  background-color: var(--dark-grey);
  color: var(--white-color);
  padding: 5px;
  margin: 5px 0 5px 0;
  text-align: left;
}

.el:hover {
  background-color: var(--background-body-offwhite);
  color: var(--nav-dark-black);
}

.display {
  width: 100%;
  padding: 25px 30px;
  text-align: center;
}

.main_content {
  background-color: var(--background-body-offwhite);
  border: transparent;
  text-align: center;
  width: 100%;
  height: 100vh;
  padding: 1rem;
}

.mammals_about {
  color: var(--nav-dark-black);
  text-align: left;
  padding: 1rem;
  text-align: center;
}

.button {
  background-color: var(--dark-grey);
  color: var(--nav-hover-text);
  padding: 0.65rem;
  margin: 1rem;
  border-radius: 8px;
  border: none;
  text-align: center;
}

.button:hover {
  background-color: var(--nav-background-green);
}

.hide {
  display: none;
}

.show {
  display: block;
}

.mammals_header {
  padding: 1rem;
  font-size: 1.2rem;
  text-align: center;
  color: var(--nav-dark-black);
}

.footer {
  background-color: coral;
  padding: 2rem;
}

.mammals_arr {
  display: flex;
  flex-direction: column;
  color: var(--white-color);
  background: var(--dark-grey);
}

.mammal {
  background-color: var(--dark-grey);
  color: var(--white-color);
}

@media (max-width:768px) {
  .sidebar {
    width: 44%;
  }

  .img {
    margin: 10px;
    width: 150px;
    border-radius: 15px;
    box-shadow: 0 2px 10px var(--dark-grey)
  }
}