html {
  overflow: -moz-scrollbars-vertical;
  background: white;
  height: 100%;
  width: 100%;
}

header {
  display: flex;
  align-items: center;
  position: relative;
  flex-direction: column;
}

.back_button {
  position: absolute;
  left: 20px;
  top:50%;
  transform: translateY(-50%);
  width: 80px;
  height: 80px;
  border: 2px solid black;
  border-radius: 8px;
  background-color: white;
  color: black;
  font-size: 14px;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
}

.back_button:hover {
  background-color: black;
  color: white;
}

.sign_in_up_out_section {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
}

.section_sign_in_up_out_button {
  width: 80px;
  height: 80px;
  border: 2px solid black;
  border-radius: 8px;
  background-color: white;
  color: black;
  font-size: 14px;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
}

.section_sign_in_up_out_button:hover {
  background-color: black;
  color: white;
}

header #title {
  color: black;
  text-decoration: none;
  padding-top: 24px;
  margin: 0px;
  font-size: 36px;
}

footer {
  margin-top: 20px;
  text-align: center;
}

.hidden {
  visibility: hidden;
}

#error_box {
  color: red;
  visibility: hidden;
  height: 60px;
}

#error_box::before {
  content: "Error: ";
}

.animated_button {
  transition: transform 0.1s;
}

.animated_button:active:not(:disabled) {
  transform: scale(0.95);
}

#gallery_container {
  display: flex;
  flex-direction: column;
}