body {
  margin: 0;
  font-family: sans-serif;
  display: grid;
  grid-template-columns: minmax(300px, 45%) 1fr;
  min-height: 100vh;
}

/* Left column */
#posterdiv {
  display: flex;
  justify-content: left;
  align-items: center;
  padding: 1rem;
}

#poster {
  max-width: 100%;
  max-height: 100vh;
}

/* Right column */
#rightSide {
  display: flex;
  flex-direction: column;
  padding: 2rem;
}

#viewer {
  flex: 1;
}

#myHeader {
  text-align: center;
}

#signupForm {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: left;
}

.signUpField,
.button {
  width: 96%;
  padding: 0.75rem;
  font-size: 1rem;
}

.button,
#dateSelect {
  width: 100%;
}

#footer {
  margin-top: 2rem;
  border-top: 1px solid #ccc;
}

li {
  font-size: 18px;
  margin: 2px 0;
}

/* Mobile layout */
@media (max-width: 700px) {
  body {
    grid-template-columns: 1fr;
  }

  #posterdiv {
    padding: 0;
  }

  #rightSide {
    padding: 1rem;
  }
  
  #signupForm {
  align-items: center;
}

  .signUpField {
    width: 91%;
  }
  
  li {
  font-size: 16px;
  margin: 2px 0;
  }
}