body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #39c5bb;
}

h1 {
    font-size: 3em;
    color: navy;
    text-align: center;
    margin-bottom: 20px;
}

h2 {
    font-size: 2em;
    color: black;
    text-align: center;
    margin-bottom: 20px;
}

h3 {
    text-align: center;
}

h4 {
    text-align: center;
    margin-bottom: 10px;
}

p {
    font-size: 1em;
    color: black;
    text-align: center;
}

details {
    font-size: 1em;
    text-align: center;
    margin-bottom: 10px;
}

summary {
    font-size : 1.5em;
    text-align: center;
}


.photo {
    width: 20%;
    height: 20%;
}

.button {
    display: inline-block;
    padding: 10px 20px;
    font-size: 16px;
    color: white;
    background-color: black;
    text-align: center;
    text-decoration: none;
    border-radius: 5px;
}

.ad {
    position: fixed;
    z-index: 1000;
}

.ad-left {
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 120px;
    height: 600px;
}

.ad-right {
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 120px;
    height: 600px;
}

.ad-bottom {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width:700px
}

.ad-mobile  {
    position: relative;
    display: block;
    margin: 10px auto;
    width: 100%;
    height: auto;
} 

@media (min-width: 999px) {
    .ad-mobile  {
        display: none;

    }
}

@media (max-width: 999px) {
    .ad-left, .ad-right, .ad-bottom {
        display: none;
    }
}