html, body {
    height:100%;
    margin:0;
    font-size: 20px;
}
.content
{
    background-image: url(back_ground.png);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    background-size: 100%;
    margin: 0 auto;
    height: 100%;
}

.powered_by
{
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 1em;
    margin: 25% 30% 30% 30%;
    text-align: center;
}

.p_1{
    font-weight: bold;
}

.p_2{
    font-size: 1em;
}

.p_2 a{
    text-decoration: none;
}