body {
    background: linear-gradient(23deg,rgba(255, 217, 0, 0.521), rgba(0, 255, 0, 0.416));
}
header {
    background: linear-gradient(45deg, lightgreen,darkgoldenrod,darkkhaki);
    height: 100px;
    width: 700px;
    margin-left: calc(50% - 700px/2);
    margin-top: 0px;
    padding: 20px;
    display: flex;
}
footer {
    max-height: calc(100% - 600px + 100px);
    height: 100px;
    width: 740px;
    margin-left: calc(50% - 700px/2);
    background-color: burlywood;
    text-align: center;
}
main {
    background-color: tomato;
    height: 500px;
    width: 720px;
    margin-left: calc(50% - 700px/2);
    padding: 10px;
    text-align: center;
}
body {
    margin: 0px;
}
header h1 {
    color: dark;
    font-size: 3em;
    font-family: monospace;
}
header img {
    border-radius: 50%;
}
#hemarq {
    background-color: aquamarine;
    text-decoration-color: rgb(0, 25, 29);
    text-shadow: 30px,darkviolet;
    font-size: 2em;
    height: 55px;
    width: 744px;
    margin-left: calc(47% - 700px/2);
}
span {
    font-size: 120%;
}