body{
  margin: 0;
  background-color: #fff;
  font-family: Arial, sans-serif;
  overflow: hidden;
}

.back-button{
  position: fixed;
  top: 15px;
  left: 15px;
  z-index: 1000;
  color: #1a1aff;
  font-style: italic;
  font-weight: 600;
  text-decoration: none;
  font-size: 16px;
  font-family: Arial, sans-serif;
}

.back-button:hover{
  text-decoration: underline;
}

.slider{
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slider img{
  max-width: 78vw;
  max-height: 80vh;
  object-fit: contain;
  display: block;
  cursor: pointer;
}

.slider video{
  max-width: 78vw;
  max-height: 80vh;
  display: block;
}

.arrow{
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: 10px 16px;
  color: #1a1aff;
  font-style: italic;
  font-weight: 600;
  font-size: 22px;
  font-family: Arial, sans-serif;
  cursor: pointer;
  z-index: 900;
}

.arrow:hover{
  text-decoration: underline;
}

.arrow-left{ left: 10px; }
.arrow-right{ right: 10px; }

@media (max-width: 700px){
  .slider img{
    max-width: 92vw;
    max-height: 70vh;
  }
  .slider video{
    max-width: 92vw;
    max-height: 70vh;
  }
  .arrow{
    font-size: 20px;
    padding: 10px 8px;
  }
}