index.css

* {
    color: #BDBFC0;
}

body {
    background-color: #1F242A;
}

#container {
    margin-left: 100px;
    margin-right: 100px;
}

#title {
}

#items {
    width: 100%;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
}

.item {
    width: 33.3%;
    float: left;
    display: flex;
}

.item .title {
    font-size: 24px;
    color: #fff;
    align-self: flex-start;
}

.item:hover {
    background-color: #1a1e23;
}

.item:hover .github {
    visibility: visible;
}

.item .content {
    display: flex;
    flex-direction: column;
    padding: 15px;
}

.item .content .decorative-line {
    margin-left: 50px;
    margin-right: 50px;
    margin-top: 15px;
    border-bottom: 1px solid #323a43;
}

.github {
    visibility: hidden;
    text-decoration: none;
    font-size: 20px;
    background-color: #fff;
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 2px 5px 2px 5px;
    border-radius: 5px;
    margin-top: auto;
    margin-bottom: 0;
    align-self: center;
    color: #1F242A; 
}

.github img {
    width: 20px;
    height: 20px;
    margin-right: 10px;
}