header {
    margin: 10px;    
    background-color:navy;
}
header h1 {
    text-align: left;
    color: whitesmoke;
    font-size: 30px;
    padding-left: 50px;
    padding-top: 1em;
}
header > img {
    width: 15%;
    height: auto;
    float: right;
    padding-right: 25px;
}
.clearright {
    clear: right;
}
nav {
    display: flex;
    justify-content: center;
    text-align: center;
    flex: 1;
}
nav > div {
    background-color:gray;
    width: 15em;
    margin: 15px;
    padding: 10px;
    font-size: 25px;
}
nav > div > a {
    color: white;
    font-weight: bold;
    text-decoration: none;
}
nav > div > a:hover {
    color: red;
    text-decoration: underline;
}
main {
    display: flex;
}
.center {
    margin: 10px;
    padding: 10px;
    padding-left: 30px;
    padding-right: 30px;
    background: rgb(236, 238, 238);
    color: navy;
    font-size: 20px;
}
.center h2 {
    color: red;
    text-align: center;
    padding-right: 80px;
    font-size: 25px;
}
main {
    display: flex;
}
main > div {
    background-color: rgb(230, 248, 254);
    margin: 5px;
    padding: 10px;
}
.left {
    flex: 1;
    color: navy;
    font-size: 20px;
}
.left h2 {
    text-align: center;
    color: red;
    font-size: 25px;
}
.left > img {
    width: 100%;
    height: auto;
    float: center;
    margin: 1px;
}
.right {
    flex: 1;
    color: navy;
    font-size: 20px;
}
.right h2 {
    text-align: center;
    color: red;
    font-size: 25px;
}
.right > img {
    width: 100%;
    height: auto;
    float: center;
    margin: 1px;
}
.video-text {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.video-text iframe {
  max-width: 100%;
}
.video-text p {
  padding-left: 50px;
  width: 60%;
  font-size: 20px;
}
footer {
    background-color: grey;
    color: white;
    margin: 10px;
    padding: 10px;
    font-size: 20px;
}
footer p {
    text-align: center;
}
@media only screen and (max-width: 1024px) {
    header h1 {
    width: flex;
    }
    header > img {
        width: 25%;
        height: auto;
        float: center;
    }
} 
@media only screen and (max-width: 510px) {

    nav {
        flex-direction: column;
    }   
    main {
        flex-direction: column;
    }   
    nav > div {
        width: auto;
        margin: 5px;
    }
    main > div {
        margin: 5px;
    }
    header h1 {
    width: flex;
    }
    header > img {
        width: 30%;
        height: auto;
        float: right;
    }
    .left > img {
        width: 100%;
        float: none;
        margin: 0;
    }
    .right > img {
        width: 100%;
        float: none;
        margin: 0;
    }
    .video-text {
        flex-direction: column;
    }
    .video-text iframe {
        width: 100%;
    }
    .video-text p {
        width: 100%;
        padding-left: 10px;
        margin-top: 10px;
    }
}