#SigNET-header {
    position: absolute;
    top: 8%;
    left: 8%;
    z-index: 10;
}
@media (max-width: 1200px) {
    #SigNET-header {
        top: 0%;
        left: 5%;
    }
    #SigNET-header > h2 {
        font-size: 40px;
    }
}

@media (max-width: 768px) {
    #SigNET-header > h2 {
        font-size: 20px;
    }
}

@media (max-width: 425px) {
    #SigNET-header > h2 {
        font-size: 10pt;
    }
}

/* 320px 已包含在 425px 范围内，无需重复 */