* {
    box-sizing: border-box;
}
body,
html {
    height: 100%;
    width: 100%;
    padding: 0;
    margin: 0;
}
.main {
    height: 100%;
    background-color: #1f2228;
}
.main-inner {
    width: 100%;
    height: 100%;
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 30px;
}
.main-inner img {
    width: 100%;
}