html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    color: #000;
    background: #FFF;
}
body {
    font: 12px/18px "Open Sans", serif;
    text-align: center;
    background: url(background-light.jpg);
    background-size: cover;
}
p {
    margin: 0;
}
p span {
    font-weight: bold !important;
}
a {
    color: #0892b6;
}
a:hover {
    color: #044859;
}
h1 {
    font-size: 50px;
    font-weight: 900;
    line-height: 50px;
    text-transform: uppercase;
    margin: 1em 0 1em 0;
    padding: 1em 0 0 0;
    border-bottom: 3px double black;
}
h2 {
    margin: 1em 0 0.5em 0;
    font-weight: 600;
    font-size: 25px;
}
footer {
    font-weight bold;
    padding: 1em 0;
    margin: 1em 0 1em 0;
    line-height: 50px;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    color: #000;
    background: #FFF;
}
body {
    font: 12px/18px "Open Sans", sans-serif;
    text-align: center;
    background: url(background-light.jpg);
    background-size: cover;
}
p {
    margin: 0;
}
p span {
    font-weight: bold !important;
}
a {
    color: #0892b6;
}
a:hover {
    color: #044859;
}
h1 {
    font-size: 50px;
    font-weight: 900;
    line-height: 50px;
    text-transform: uppercase;
    margin: 1em 0 1em 0;
    padding: 1em 0 0 0;
    border-bottom: 3px double black;
}
h2 {
    margin: 1em 0 0.5em 0;
    font-weight: 600;
    font-size: 25px;
}
footer {
    font-weight bold;
    padding: 1em 0;
    margin: 1em 0 1em 0;
    line-height: 50px;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
}

Use sans-serif instead of serif as default font.
Use sans-serif instead of serif as default font.
