h1 {
    color: #000000;
    font-size: 50px;
    margin-top: 20px;
    margin-right: 100px;
    margin-left: 20px;
}

header {
    display: flex;
    align-items: flex-start;
    background-color: #fde9b0;
    padding: 20px;
}

#ul1 {
    padding: 20px;}

#p1 {
    margin-left: 20px;
    font-size: medium;
    text-indent: 50px;
}

h2 {
    padding : 20px;
}

table {
    border-collapse: collapse;
    width: 50%;
    margin-left: 20px;
}

th, td {
    padding: 2px;
    border: 2px solid black;
    text-align: center;
}

mark {
    background-color: rgb(216, 216, 209);
    color: black;
    font-weight: bold;
}

kbd {
    background-color: #f1f1f1;
    color: black;
    padding: 5px;
}

img {
    display: block;
    margin-left: auto;
    width: 200px;
    height: auto;
    border-radius: 70%;
    margin-top: 20px;
}

#contact {
    font-size: large;
    font-weight: bold;
    margin-left: 20px;
}

#courses {
    font-size: x-large;
    font-weight: bold;
    margin-left: 20px;
}

footer {
    margin-left: 10px;
}

.container-video {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-left: 400px;
    margin-right: 400px;
}

.container-video iframe, .container-video video {
    width: 320px;
    height: 240px;
}