.mainContent {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 5px;
}

.em {
    border: solid;
    padding: 2px;
    margin-bottom: 10px;
}

.con {
    max-width: 750px;
    width: 100%;
    text-align: center;
    margin-top: 68px;
}

.ab {
    text-align: center;
}

iframe {
    width: 560px;
    height: 315px;
}

.rec {
    max-width: 750px;
    width: 100%;
    margin-bottom: 25px;
}

.rec h2 {
    text-align: center;
    text-decoration: underline;
}

.em {
    border: solid;
    padding: 2px;
    text-align: center;
    margin-bottom: 10px;
}

.em img {
    width: 180px;
}

#myBtn {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 20px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: green;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
    font-family: 'Work Sans', sans-serif;
}

#myBtn:hover {
    background-color: #555;
}

@media only screen and (max-width:580px) {
    iframe {
        width: 100%;
        height: 280px;
    }
}