body {
  margin: 0;
  overflow-x: scroll;
}
#sea {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1;
    height: 100vh;
    width: 300rem;
}
#intro-h1-container {
    text-align: center;
    margin: 0;
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
}
h1 {
    font-size: 3rem;
}