* {
    box-sizing: border-box;
}

img {
    vertical-align: middle;
}

body {
    width: 100vw;
    overflow: hidden;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    background: url(../img/pc/bg.jpg?v=9) no-repeat;
    background-size: 100% 100%;
}

header {
    display: flex;
    align-items: flex-start;
    padding: 5vh 4vw 0;
}

header>img:nth-of-type(2) {
    cursor: pointer;
    margin-left: auto;
    margin-right: 20px;
}

header>img:last-of-type {
    cursor: pointer;
}

main {
    flex: 1;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.qr-box {
    padding-bottom: 5vh;
    position: relative;
}

#qrcode {
    position: absolute;
    top: 20px;
    width: 100%;
    display: flex;
    justify-content: center;
}

#qrcode>img {
    object-position: center;
    object-fit: contain;
}