:root {
 background-color: #dde3e4;
}

#intro {
  text-align: center;
}

a {
  text-decoration: none;
}

#timer {
  float: right;
}

#mainContent {
  text-align: center;
  margin: 100px auto auto auto;

}

button {
  width: 350px;
  height: 50px;
  margin: 25px auto;
  padding: 15px;
  display: flex;
  justify-content: center;
  background-color: #9bc5d4;
  font-size: 18px;
}

button:disabled {
  color:black;
  border-color: -internal-light-dark(rgb(118, 118, 118), rgb(133, 133, 133));
}

.btn {
  text-decoration: none;
  padding:5px;
  cursor: default;
  box-sizing: border-box;
  border-style: outset;
  border: solid 1px;
  background-color: #9bc5d4;
  color: black;

} 

table {
  display: flex;
  justify-content: center;
}