.triangle-obtuse {
  position:relative;
  padding:15px;
  margin:1em 0 1em;
  color:#000000;
  background:#c81e2b;
  /* css3 */
  background:-webkit-gradient(linear, 0 0, 0 100%, from(#f04349), to(#c81e2b));
  background:-moz-linear-gradient(#f04349, #c81e2b);
  background:-o-linear-gradient(#f04349, #c81e2b);
  background:linear-gradient(#f04349, #c81e2b);
  -webkit-border-radius:10px;
  -moz-border-radius:10px;
  border-radius:10px;
}

/* Variant : for top positioned triangle
------------------------------------------ */

.triangle-obtuse.top {
  background:-webkit-gradient(linear, 0 0, 0 100%, from(#c81e2b), to(#f04349));
  background:-moz-linear-gradient(#c81e2b, #f04349);
  background:-o-linear-gradient(#c81e2b, #f04349);
  background:linear-gradient(#c81e2b, #f04349);
}

/* Variant : for left positioned triangle
------------------------------------------ */

.triangle-obtuse.left {
  margin-left:50px;
  background:#c6f3fb;
}

/* Variant : for right positioned triangle
------------------------------------------ */

.triangle-obtuse.right {
  margin-right:50px;
  background:#fff799;
}

/* THE TRIANGLE
------------------------------------------------------------------------------------------------------------------------------- */

/* creates the wider right-angled triangle */
.triangle-obtuse:before {
  content:"";
  position:absolute;
  bottom:-20px; /* value = - border-top-width - border-bottom-width */
  left:60px; /* controls horizontal position */
  border:0;
  border-right-width:30px; /* vary this value to change the angle of the vertex */
  border-bottom-width:20px; /* vary this value to change the height of the triangle. must be equal to the corresponding value in :after */
  border-style:solid;
  border-color:transparent #c81e2b;
  /* reduce the damage in FF3.0 */
  display:block;
  width:0;
}

/* creates the narrower right-angled triangle */
.triangle-obtuse:after {
  content:"";
  position:absolute;
  bottom:-20px; /* value = - border-top-width - border-bottom-width */
  left:80px; /* value = (:before's left) + (:before's border-right/left-width)  - (:after's border-right/left-width) */
  border:0;
  border-right-width:10px; /* vary this value to change the angle of the vertex */
  border-bottom-width:20px; /* vary this value to change the height of the triangle. must be equal to the corresponding value in :before */
  border-style:solid;
  border-color:transparent #fff;
  /* reduce the damage in FF3.0 */
  display:block;
  width:0;
}


/* Variant : left
------------------------------------------ */

.triangle-obtuse.left:before {
  top:15px; /* controls vertical position */
  bottom:auto;
  left:-50px; /* value = - border-left-width - border-right-width */
  border:0;
  border-bottom-width:30px; /* vary this value to change the height of the triangle */
  border-left-width:50px; /* vary this value to change the width of the triangle. must be equal to the corresponding value in :after */
  border-color:#c81e2b transparent;
}

.triangle-obtuse.left:after {
  top:35px; /* value = (:before's top) + (:before's border-top/bottom-width)  - (:after's border-top/bottom-width) */
  bottom:auto;
  left:-50px; /* value = - border-left-width - border-right-width */
  border:0;
  border-bottom-width:10px; /* vary this value to change the height of the triangle */
  border-left-width:50px; /* vary this value to change the width of the triangle. must be equal to the corresponding value in :before */
  border-color:#fff transparent;
}

/* Variant : right
------------------------------------------ */

.triangle-obtuse.right:before {
  top:15px; /* controls vertical position */
  bottom:auto;
  left:auto;
  right:-50px; /* value = - border-left-width - border-right-width */
  border:0;
  border-bottom-width:30px; /* vary this value to change the height of the triangle */
  border-right-width:50px; /* vary this value to change the width of the triangle. must be equal to the corresponding value in :after */
  border-color:#c81e2b transparent;
}

.triangle-obtuse.right:after {
  top:5px; /* value = (:before's top) + (:before's border-top/bottom-width)  - (:after's border-top/bottom-width) */
  bottom:auto;
  right:-50px; /* value = - border-left-width - border-right-width */
  left:auto;
  border:0;
  border-bottom-width:10px; /* vary this value to change the height of the triangle */
  border-right-width:50px; /* vary this value to change the width of the triangle. must be equal to the corresponding value in :before */
  border-color:#fff transparent;
}