CSS Triangle
.entry-title {
line-height: 1;
background: #47484a;
position: relative;
color: #fff;
padding: 14px 34px;
margin-bottom: 40px;
}
.entry-title:after {
content: '';
width: 0;
height: 0;
border-style: solid;
border-width: 0 0 60px 35px;
border-color: transparent transparent #d92a27 transparent;
position: absolute;
right: 0;
bottom: 0;
}