@media screen and (max-width: 2560px)
{
    div.certificates
    {
        text-align: center;
        padding-top: 5%;
        padding-bottom: 10%;
    }
    h1.certificates
    {
        color: whitesmoke;
        font-size: 60px;
        padding: 1%;
    }
    img.certificate
    {
        width: 25%;
        padding: 1%;
    }
}

@media screen and (max-width: 1920px)
{
    div.certificates
    {
        text-align: center;
        padding-top: 5%;
        padding-bottom: 10%;
    }
    h1.certificates
    {
        color: whitesmoke;
        font-size: 60px;
        padding: 1%;
    }
    img.certificate
    {
        width: 25%;
        padding: 1%;
    }
}

@media screen and (max-width: 1000px)
{
    div.certificates
    {   
        padding-bottom: 200px;
    }
    img.certificate
    {
        width: 50%;
    }
}

/* --------------------- */
.full-img
{
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    position: fixed;
    top: 0;
    left: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.full-img img
{
    width: 90%;
    max-width: 500px;
}

.full-img span
{
    position: absolute;
    top: 5%;
    right: 5%;
    font-size: 30px;
    color: #fff;
    cursor: pointer;
}