#about-page {
  padding: 0 5vw;
  flex-grow: 1;
  font-size: 16px;
  line-height: 24px;
  width: 1200px;
  max-width: 90vw;
}

#about-page P {
  margin: 0 0 20px;
}

#head {
  background-color: var(--primary-color);
  height: 50px;
  align-items: center;
  justify-content: space-between;
  display: flex;
  margin-bottom: 5px;
  padding: 0 10px;
  position: sticky;
  top: 0;
}

#mobile {
  height: auto;
  mask-image: linear-gradient(white 40%, transparent 70%);
  border: 5px solid black;
  border-radius: 10px;
  position: absolute;
  left: 0;
  right: 20vw;
  margin: auto;
  z-index: -1;
  top: calc(18vw + 55px);
  transform: rotate(-5deg);
  max-height: 50vh;
  width: auto;
  max-width: 15vw;
}

#mobile2 {
  display: none;
}

#desktop {
  max-width: 90vw;
  max-height: 80vh;
  width: auto;
  height: auto;
  mask-image: linear-gradient(white 40%, transparent 80%);
  border: 5px solid black;
  border-radius: 10px;
  position: absolute;
  left: 0;
  right: 0;
  top: 80px;
  margin: auto;
  z-index: -2;
}

#get-started {
  display: flex;
  align-items: center;
  justify-content: space-around;
}

#slogan {
  max-width: 850px;
  background: rgba(255,255,255,90%);
  margin: 15px;
}

#spacing {
  height: 65vh;
  max-height: 40vw;
}

.footer-narrow {
  background-color: var(--primary-color);
  align-items: flex-start;
  justify-content: space-around;
  padding: 10px;
  margin-top: 50px;
  display: none;
}

.footer-narrow a {
  color: var(--text-color);
}

.footer-wide {
  background-color: var(--primary-color);
  padding: 10px 5vw;
  margin-top: 50px;
}

.footer-wide a:not(:first-child) {
  border-left: 1px solid var(--text-color);
}

.footer-wide a {
  padding-left: 5px;
  color: var(--text-color);
}

.join-button {
  display: flex;
  justify-content: center;
  align-content: center;
  border: 1px solid black;
  padding: 25px;
  border-radius: 10px;
  transition: all 200ms;
  min-width: 400px;
  margin: 5px;
}

.join-button h3 {
  color: var(--primary-accent);
  font-size: 28px;
}

.join-button p {
  color: black;
}

.join-button:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-accent);
}

.join-button:hover h3 {
  color: black;
}

.about-nav {
  font-size: 120%;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--text-color);
}

.about-nav h2 {
  margin-bottom: 20px;
}

.about-nav a {
  color: var(--text-color);
  margin: 0;
  padding: 10px;
  margin-bottom: -2px;
}

.about-nav a:hover {
  color: var(--primary-accent);
  text-decoration: none;
  border-bottom: 4px solid var(--primary-accent);
}

.about-nav span {
  border-bottom: 4px solid var(--primary-accent);
  color: var(--primary-accent);
  margin: 0;
  padding: 10px;
  margin-bottom: -2px;
}

.info {
  padding: 15px;
  margin: 15px;
  border-radius: 15px;
  display: flex;
  align-items: center;
}

.link-button {
  display: inline-block;
  justify-content: center;
  align-content: center;
  border: 1px solid black;
  padding: 25px;
  border-radius: 10px;
  transition: all 200ms;
  min-width: 250px;
  margin: 5px;
  color: var(--primary-accent);
}

.project-link {
  border: 1px solid var(--text-color);
  border-radius: 15px;
  text-align: left;
  width: 100%;
  display: inline-block;
  padding: 15px;
  color: var(--text-color);
}

.project-link:hover {
  color: var(--primary-accent);
}

.textbook-container {
  border: 2px solid var(--text-color);
  border-radius: 5px;
  padding: 5px;
  margin-left: 5px;
  margin-bottom: 10px;
  display: inline-block;
  width: 100%;
}

@media screen and (min-width: 1500px) {
  h2 {
    font-size: 40px;
  }
  
  #slogan {
    max-width: 2000px;
  }
}

@media screen and (max-width: 1000px) {
  #mobile {
    mask-image: linear-gradient(white 40%, transparent 80%);
    left: 0;
    right: 60%;
    top: 80px;
    transform: rotate(-5deg);
    max-height: max(50vh, 50vw);
    max-width: 25vw;
  }
  
  #desktop {
    mask-image: linear-gradient(white 40%, transparent 90%);
    left: 20vh;
    max-width: 65vw;
    top: 100px;
    transform: rotate(8deg);
    max-height: 100vh;
  }
  
  #slogan {
    max-width: 600px;
  }
  
  #spacing {
    max-height: 45vw;
  }
  
  .join-button {
    min-width: 260px;
    padding: 15px;
  }
  
  .join-button h3 {
    font-size: 24px;
  }
  
  .textbook-container {
    width: 90vw;
  }
}

@media screen and (max-width: 600px) {
  
  #mobile {
    display: none;
  }
  
  #mobile2 {
    height: auto;
    width: auto;
    mask-image: linear-gradient(white 50%, transparent 60%);
    border: 5px solid black;
    border-radius: 10px;
    position: absolute;
    margin: auto;
    z-index: -1;
    max-width: 80vw;
    max-height: 200vh;
    left: 0;
    right: 0;
    top: 80px;
    display: block;
  }
  
  #desktop {
    transform: rotate(0deg);
    left: 0;
    max-width: 90vw;
    mask-image: linear-gradient(white 70%, transparent 95%);
    top: 30vh;
  }
  
  #get-started {
    flex-direction: column;
  }
  
  #spacing {
    max-height: 80vw;
  }
  
  .footer-narrow {
    display: flex;
  }

  .footer-wide {
    display: none;
  }
}