#dbtdown {
    border: none;
    font-size: 18px;
    letter-spacing: 1px;
    background-color: black;
    color: white;
    padding-top: 10px;
    padding-bottom: 10px;
    padding-left: 50px;
    padding-right: 50px;
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.2s;
    margin: 5px;
}
#dbtdown:hover {
    background-color: #202020;
}

#flexdiv
{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    align-content: flex-start;
}

.wallpaper {
    width: 300px;
    margin: 10px;
    border-radius: 10px;
    transition: all 0.6s;
}
.wallpaper:hover {
    opacity: 0.9;
    transition: all 0.1s;
    filter: contrast(125%);
}