#div_top{
    background-color: inherit;
    opacity: 0.60;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 10px;
}

#p_title{
    margin: 0;
    font-size: 22px;
    font-weight: bold;
}

#lnk_login{
    text-decoration: none;
    border: 1px solid black;
    border-radius: 5px;
    padding: 5px 10px;
}

/* background image */
#img_background{
    width: 100vw;
    height: 100vh;
    background-image: url('your-image.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    opacity: 0.40;
}

#div_content{
    display: flex;
    flex-direction: row;
    z-index: 100;
    width: 60%;
    margin-left: 20%;
}
#img_logo{
    width: 100px;
    height: auto;
    margin-top: 30px;
}
#p_welcome{
    font-size: 36px;
    font-family:Arial, Helvetica, sans-serif;
}

/* footer */
#div_footer{
    background-color: inherit;
    text-align: center;
    padding: 15px 0;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100vw;
    font-size: 11px;
    z-index: 200;
}