.katex svg {
    display: block !important;
    background: transparent !important;
    width: auto !important; 
} 
.katex * {
    border-style: none !important;
}

.katex .frac-line{
    border-bottom-style: solid !important; 
}
svg { border: 2px solid #333; background-color: #000000; border-radius: 8px; width: 60%; display: block; margin: 0 auto;}