Need css help

Site URL: https://cinochee.com/jasper

Hi!

I need help , I want to display h2 and p over mouse hover like this https://jasper-demo.squarespace.com/.  @tuanphan @ciaccogelato

the code

.custom-html a {
    position: relative;
    display: block
}

.custom-html a:after {
    content: "";
    background-color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    opacity: 0
}

.custom-html center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 999999999999;
    opacity: 0
}

.custom-html h2,.custom-html p {
    display: block
}

.custom-html:hover center {
    opacity: 1
}

.custom-html:hover a:after {
    opacity: 1
}