body {
 background-size:cover;
 background-color:#000;
 color:#fff;
 height:100%;
 text-align:center;
 overflow:hidden;
 vertical-align:middle;
 font-family:'Fira Mono';
 padding: 50px;
}
h1 {
 font-size: 5em;
}
.link_button{
 background-color: #8ac148;
text-decoration: none;
text-align: center;
color: black !important;
border-radius: 10px;
 padding: 15px;
 cursor:pointer;
}
td {
 padding:20px;
}
table{
 text-align: center;
 margin-left: auto;
margin-right: auto;
}

/* Checkmark styles */
.checkmark {
  font-size: 200px;
  color: green;
  position: fixed;
  top: 80%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  animation: fadeInOut 1s ease-in-out;
}

/* Keyframe animations */
@keyframes fadeInOut {
  0% {
    opacity: 1;
  }
 50% {
    opacity:1;
 }
  100% {
    opacity: 0;
  }
}