body{
    margin: 0;
    padding: 0;
}

.tb-body {
    height: 100vh;
    background: url(bgtest.png) center/cover no-repeat, black;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-bottom: 20vh;
    box-sizing: content-box;
}

.tb-logo-svg{
    width: 90vw;
    opacity: 0; /* <-- เพิ่มตรงนี้ เพื่อไม่ให้แว๊บ */
    will-change: opacity, transform, filter;
}