<div class="arrow arrow-left">стрелка влево</div>
<br>

<div class="arrow arrow-top">стрелка вверх</div>
<br>

<div class="arrow arrow-bottom">стрелка вниз</div>
<br>
<div class="arrow arrow-right">стрелка вправо</div>
<br>

body {
	font-size:14px;
	padding: 15px 20px;
    display: flex;
    justify-content: flex-start;
}

.arrow {
    width: 150px;
	margin: 20px;
	padding: 10px;
	position: relative;
	background: #fff;
	border: 1px solid orange;
	text-align: center;   
}

.arrow:after,
.arrow:before {
    content: ""; 
	border: solid transparent;
	position: absolute;
}

/* Left-Top */
.arrow-left:after, 
.arrow-left:before {
	left: -20px;    
	right: 100%;
    transform: rotate(-90deg);
}
.arrow-left:after {
	border-bottom-color: #fff;
	border-width: 9px;
    margin-left: 1px;
}
.arrow-left:before {
	border-bottom-color: orange;
	border-width: 9px;
	margin-left: 0px;
}

/* Top */
.arrow-top:after, 
.arrow-top:before {
	left: calc(50% - .5rem);
	bottom: 100%;
}
.arrow-top:after {
	border-bottom-color: #fff;
	border-width: 8px;
}
.arrow-top:before {
	border-bottom-color: orange;
	border-width: 9px;
	margin-left: -1px;
}

/* Bottom */
.arrow-bottom:after, 
.arrow-bottom:before {
	left: calc(50% - .5rem);
	bottom: -18px;
    transform: rotate(180deg);
}
.arrow-bottom:after {
	border-bottom-color: #fff;
	border-width: 10px;
    margin-left: -2px;
}
.arrow-bottom:before {
	border-bottom-color: orange;
	border-width: 9px;
	margin-left: -1px;
}
/* right*/
.arrow-right:after, 
.arrow-right:before {
	right: -20px;    
	left: 100%;
    transform: rotate(90deg);
}
.arrow-right:after {
	border-bottom-color: #fff;
	border-width: 9px;
    margin-right: 2px;
}
.arrow-right:before {
	border-bottom-color: orange;
	border-width: 9px;
	margin-right: 0px;
}