html{
    height: 100%;
}
body{
    height:80%;
    background-image: url("https://stumpark.com/web_images/IMG_1227.jpg");
    background-size: cover;
    background-repeat: no-repeat;
}

.menu{
    margin: 20% 1em;
    padding: 0 1em 3em 1em;
}

.container{
    margin:auto;
    width: 400px;
}

#logo{ 
    font-size: 3.5rem;
    font-weight: bold;
    color: #ffffff;
    text-align: center;
    font-family: Roboto HYGothic H2HDRM;
}
#content {
    margin: auto;
}
#content tr td{
    padding:0 20px;
    height: 150px;
    width: 150px;
    cursor: pointer;
}
#dsm-logo{
    background-image: url("https://stumpark.com/web_images/DSM_Vista_Glass_logo.png");
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: center;
}
#dsm-logo:hover {
    background-image: url("https://stumpark.com/web_images/DSM_Vista_Glass_logo(hover).png");
}
#blog-logo{
    background-image: url("https://stumpark.com/web_images/Blog_Vista_Glass_logo.png");
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: center;
}
#blog-logo:hover {
    background-image: url("https://stumpark.com/web_images/Blog_Vista_Glass_logo(hover).png");
}
#gitlab-logo{
    background-image: url("https://stumpark.com/web_images/Gitlab_Vista_Glass_logo.png");
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: center;
}
#gitlab-logo:hover {
    background-image: url("https://stumpark.com/web_images/Gitlab_Vista_Glass_logo(hover).png");
}