.text-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

body {
    background: #bfe8ff;
}

h1 {
    margin: 100px auto;
    font-size: 63px;
    color: rgb(31, 96, 175);
}

p {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 26px;
}

h2 {
    display: flex;
    justify-content: center;
    align-items: center;
    color: #005097;
    font-size: 48px;
}

div#top-download {
    width: 250px;
    height: 100px;
    background: #005097;
    color: #e2e2e2;
    border-radius: 15px;
    font-family: 黑体;
    font-weight: 900;
    font-size: 36px;
}

div#box-top-download {
    width: 250px;
    height: 250px;
    padding: auto;
    margin: auto;
    background: radial-gradient(circle, rgb(57, 97, 255), #bfe8ff);
}