style.css

body {
    background: #e7eaf0;
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

* {
    box-sizing: border-box;
}

p {
    margin-top: 0;
    margin-bottom: .5em;
}

a {
    color: inherit;
    text-decoration: none;
}

p:last-child {
    margin-bottom: 0;
}

.site-header {
    background: #242a35;
    padding: 40px 20px;
    text-align: center;
}

.site-header img {
    width: 150px;
}

.site-description {
    font-size: 18px;
    text-align: center;
}

.site {
    padding: 40px 20px;
    max-width: 740px;
    margin: 0 auto;
}

.documentations {
    margin: 0 -20px 80px;
}

.documentations::after {
    content: '';
    display: table;
    clear: both;
}

.documentation {
    width: 100%;
    padding: 20px;
}

.documentation-wrapper {
    display: block;
    padding: 20px;
    border-radius: 10px;
    background: #fff;
    border: 1px solid #242a35;
    transition: .3s;
}

.documentation-wrapper:hover .documentation-title {
    color: #017eff;
}

.documentation-wrapper:hover {
    box-shadow: 2px 2px 0 0 rgba(36, 42, 53, 1);
}

.documentation-title {
    font-size: 24px;
    font-weight: 600;
    transition: .3s;
}

.documentation-description {
  color: #404040;
}