纯css样式实现3角型

.devise-wele-triangle{
border-right: #c 8px solid !important;
border-: transparent 6px solid !important;
border-bottom: transparent 6px solid !important;
margin-left: -8px;
float: left;
z-index: 1000;
position: relative;
margin-: 12px;
width: 0px;
height: 0px;
}
.devise-wele-triangle div{
border-right: #EEEEEE 8px solid !important;
border-: transparent 6px solid !important;
border-bottom: transparent 6px solid !important;
float: left;
z-index: 1100;
position: relative;
width: 0px;
margin-left: 4px;
margin-: -6px;
height: 0px;
}