.background-airpure {
    position: fixed;
    bottom: 9vw;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    z-index: -1;
    pointer-events: none;
}
.background-airpure span {
    font-size: 30vw;
    font-weight:lighter;
    line-height: 0vw;
    color: rgba(0, 0, 0, 0.05);
    white-space: nowrap;
    user-select: none;
}