*{
    box-sizing: border-box;
}
body{
    background-color: #272A31;
}
.gallery-img {
    display: none;
    height:600px;
}
.active{
    display:block;
}
.image-gallery {
     width: 100%;
     display: flex;
     justify-content: center;
     align-items: center;
}
.btns {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .btn {
    background-color: #0074d9;
    color: white;
    font-size: 20px;
    padding:5px 20px;
    border-color:transparent;
    border-radius:5px;
    cursor:pointer;
  }
  .prev{
      margin-right: 15px;
  }
  .btn:disabled {
      background-color: #777;
      cursor: not-allowed;
  }