style.css

body {
    background-image: url('xenos.png');
    color: rgb(0,0,0);
    padding: 10px;
    font-family: arial;
}
#all-contents {
  max-width: 800px;
    margin: auto;
}

/* navigation menu */
nav {
    background: rgb(0, 255, 0);
   margin: 0 auto;
   margin-bottom: 20px;
    display: flex;
    padding: 10px;
    border-radius: 30px;
}
h1 {
    display: flex;
    align-items: center;
    color: rgb(0,0,0);
    flex: 1;
    margin: 50px;
}
#nav-ul {
    list-style-image: none;
}
.nav-li {
    display: inline-block;
    padding: 0 10px;
}
a {
    text-decoration: none;
    color: #000000;
}

/* main container area beneath menu */
main {
    background: rgb(0,200,200);
    display: flex;
}
.sidebar {
    margin-right: 0px;
    padding: 10px;
    display: flex;
}
.sidebar-img {
    width: 200px;
    border-radius: 50px;
}
.content {
    flex: 1;
    padding: 15px;
}

/* portfolio styles */
#interests {
    border: 4px rgb(0,0,0) ridge;
    padding: 8px;
}
h2, h3 {
    margin: 0px;
}

/* portfolio styles */
.content h1 {
    color: black;
}

#portfolio {
    list-style-type: none;
    padding-left: 0;
}

#portfolio li {
    background: rgb(200,200,0);
    padding: 5px;
    border-radius: 10px;
    margin-bottom: 10px;
}

#portfolio li:hover {
    background: #eee;
}

#portfolio a {
    text-decoration: none;
    color: #454545;
}

/* responsive web design */
@media screen and (min-width: 120px) and (max-width: 1920px) {
main {
    height: 100ch;
    zoom: 0;
    display: grid;
}

h1 {
    font-size: xx-large;
}

h2 {
    font-size: xx-large;
}

h3 {
    font-size: medium;
}

#all-contents {
    height: 100ch;
    margin: none;
}

/* Portfolio Lists */
a {
    font-size: larger;
}

.sidebar {
    margin-right: 0px;
    justify-content: center;
    align-items: center;
}

.sidebar-img {
    width: 100%;
}

p,
li {
    font-size: large;
}

.content {
    align-content: center;
    justify-content: center;
}
}