body {
    height: 100%;
    margin: 0;
    font: 400 15px/1.8 "Lato", sans-serif;
    color: #777;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}
  
.btn {
    width: 200px;
    font-size: 18px;
    padding: 10px;
    border: none;
    background: #000;
    color: #fff;
    cursor: pointer;
    margin: 5px;
}
  
.btn:hover {
    background: #ddd;
    color: black;
}