body {
    background-color: lightskyblue;
}

h1 {
    font-size: 1,000;
}
h2 {
    font-size: 3,000;
}
h3 {
    font-size: 3,000;
}
h4 {
    font-size: 3,000;
}
h5 {
    font-size: 3,000;
}
h6 {
    font-size: 3,000;
}
img {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 40%;
}

td {
    height: 100%;
    vertical-align: bottom;
  }
tr {
    text-align: center;
}

.center {
    margin: auto;
    width: 50%;
    border: 3px solid green;
    padding: 10px;
}