.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

button {
    padding: 15px;
    margin-top: 20px;
    border: none;
    border-radius: 18px;
    font-size: 20px;
    font-weight: 600;
    background-color: hsl(210, 100%, 50%);
    color: #fff;
    cursor: pointer;
}

button:hover {
    background-color: hsl(210, 100%, 60%);
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%; /* or any other percentage */
}