Css not working in landing page

We are having issue with the custom css for our landing page. Nothing is working and not sure where the issue is. Here’s the code if anybody can help thank you

h1 { line-height: 58px; text-transform: uppercase; font-weight: 600; font-family: 'Montserrat',sans-serif; font-size: 48px !important; color: #378890; font-style: normal; } h2 { line-height: 34px; font-weight: 300; font-family: 'Montserrat',sans-serif; font-size: 28px !important; color: #005C63; font-style: normal; } h3 { line-height: 58px; font-weight: 100; font-family: 'Montserrat',sans-serif; font-size: 48px !important; color: #005C63; font-style: normal; } h4 { line-height: 24px; font-weight: 300; font-family: 'Montserrat',sans-serif; font-size: 20px !important; color: #005C63; font-style: normal; } p { line-height: 24px; font-weight: 100; font-family: 'Roboto'; font-size: 16px !important; color: #005C63; font-style: normal; }

You probably just need to mark everything as !important;