html {
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif
}
.center {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 80vh;
    justify-content: center;
    text-align: center;
}

.button {
    background-color: white;
    border: black 2px solid;
    width: 150px;
    margin: 5px auto;
    border-radius: 5px;
    text-decoration: none;
    color: black;
    transition: all .5s;
}

.button:hover {
    background-color: #29cf23;
}