We can use a skewed pseudo element to make the slanted edge of your element.
div {
position: relative;
display: inline-block;
padding: 1em 5em 1em 1em;
overflow: hidden;
color: #fff;
}
div:after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: #000;
-webkit-transform-origin: 100% 0;
-ms-transform-origin: 100% 0;
transform-origin: 100% 0;
-webkit-transform: skew(-45deg);
-ms-transform: skew(-45deg);
transform: skew(-45deg);
z-index: -1;
}
