css样式设置方框右上角小图标

			.rem_icon {
				position: absolute;
				width: 0;
				height: 0;
				border-top: 20px solid transparent;
				border-bottom: 20px solid transparent;
				border-left: 30px solid #000000;
				border-radius: 50%;
				transform: translate(0 , -30px) rotate(-40deg);
				text-align: left;
				color: #FFFFFF;
			}
			.rem_icon:after{
				content: '+';
				color: #ffffff;
				position: absolute;
				left: -30px;
				bottom: -13px;
			}

这个才是神手的，服.