.overblock {
    position: absolute;
    
    font-size: 14px;
    //background: #0009;
    color: #fff;
    padding: 5px;
    border-radius: 3px;
    word-break: break-word;
    width: 100%;
    left: 0px;
    transform: translateY(10px);
    opacity: 0;
    visibility: hidden;
    transition: all .3s;
    pointer-events: none;
    -ms-user-select: none;
    -moz-user-select: none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    transition: all .3s;
}

.hoverboard {
    max-width: 900px;
    margin: 0 auto;
    padding: 10px;
    font-weight: 100;
    font-family: sans-serif;
    /*backdrop-filter: blur(5px);*/
    background: #444;
    border-radius: 3px;
}

.hoverboard img {
    margin-bottom: 10px;
    max-width: 900px;
    max-height: 400px;
}

#HoverLetter {
    position: absolute;
    left: 0px;
    top: 0px;
    width: Calc(100% - 10px);
    height: 100%;
    pointer-events: none;
    z-index: 5000000;
    box-sizing: border-box;
}

#HoverLetter:before {
    transition: opacity 1s;
    opacity: 0;
    visibility: hidden;
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    //background: #000D;
    content: "";
    pointer-events: none;
    //backdrop-filter: blur(1px);
}

.black:before {
    //opacity: 1 !important;
    //visibility: visible !important;
}


.mainblock:hover {
    color: #000;
}

.mainblock:hover .overblock {
    opacity: 1;
    visibility: visible;
    transform: translateY(-2px);
}

.mainblock {
    text-decoration: underline;
    display: inline-block;
}

.treug {
    border-left: 5px solid #0000;
    border-top: 5px solid #0009;
    border-right: 5px solid #0000;
    top: Calc(100% - 5px);
    left: 50%;
    position: absolute;
    margin-left: -3px;
}

.c {
    text-align: center;
}

.mainblock:hover:before {
    opacity: 1;
    visibility: visible;
}

.overblock:before {
    transition: opacity 1s;
    opacity: 0;
    visibility: hidden;
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    background: #000C;
    content: "";
    pointer-events: none;
    box-sizing: border-box;
}


.hide {
    display: none;
}

.show {
    visibility: visible;
    opacity: 1;
}