Some css shortcuts

css_shortcuts.css

// disallow select content on the page
.no-select {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/*
 * https://github.com/h5bp/html5-boilerplate/blob/v5.0.0/src/css/main.css#L126-L156
 *
 * Hide only visually, but have it available for screen readers:
 * http://snook.ca/archives/html_and_css/hiding-content-for-accessibility
 */
.visuallyhidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

/*
 * Extends the .visuallyhidden class to allow the element
 * to be focusable when navigated to via the keyboard:
 * https://www.drupal.org/node/897638
 */
.visuallyhidden.focusable:active,
.visuallyhidden.focusable:focus {
    clip: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    position: static;
    width: auto;
}


/* Center elements */

// 1. Center using grid

.container {
    display: grid;
    height: 100vh;
    margin: 0;
    place-items: center center;
}


//2. Using Flexbox

html, body, .container {
    height: 100%;
}
.container {
    display: flex;
    align-items: center;
    justify-content: center;
}


//3. Using position absolute

.container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}