Simple HTML and CSS site made using CSS Grid for Layout

Hi

You can create the pointed corner using ::after css psuedo element like this

.storage-remaining::after{
        content: '';
        width: 0;
        height: 0;
        border-top: solid 20px white;                 // These two styles create the pointed corner
        border-left: solid 20px transparent;
        position: absolute;
        right: 0px;                                              // These styles position it at bottom-right corner
        bottom: -20px;
    }

This looks good. There are a couple ways to make the buttons work. My solution was to set the width of the images, and place them in a <div>. I used the div padding for the button.