.challenge{
    min-height: 100vh;
}
.dropdown {
    position: absolute;
    display: inline-block;
    top: 40%;
    right: 12%;
    font-size: 1.2em;
  }
  
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    padding: 12px 16px;
    z-index: 1;
  }
  
  .dropdown:hover .dropdown-content {
    display: block;
  }
  

button {
    padding: 15px 25px;
    border: unset;
    border-radius: 15px;
    color: #212121;
    z-index: 1;
    background: #e8e8e8;
    position: absolute;
    top:20%;
    font-weight: 1000;
    font-size: 17px;
    -webkit-box-shadow: 4px 8px 19px -3px rgba(0,0,0,0.27);
    box-shadow: 4px 8px 19px -3px rgba(0,0,0,0.27);
    transition: all 250ms;
    overflow: hidden;
   }
   
   button::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    border-radius: 15px;
    background-color: #212121;
    z-index: -1;
    -webkit-box-shadow: 4px 8px 19px -3px rgba(0,0,0,0.27);
    box-shadow: 4px 8px 19px -3px rgba(0,0,0,0.27);
    transition: all 250ms
   }
   
   button:hover {
    color: #e8e8e8;
   }
   
   button:hover::before {
    width: 100%;
   }