<span class="borders"></span>
<span class="triangles"></span>
<span class="triangle"></span>
.borders {
    display: inline-block;
    width: 50px; height: 50px;
    border-top: 20px solid #777;
    border-right: 20px solid #999;
    border-bottom: 20px solid #bbb;
    border-left: 20px solid #ddd;
    margin-right: 15px;
}

.triangles {
    display: inline-block;
    width: 0; height: 0;
    border-top: 20px solid #777;
    border-right: 20px solid #999;
    border-bottom: 20px solid #bbb;
    border-left: 20px solid #ddd;
    margin-right: 15px;
}

.triangle {
    display: inline-block;
    width: 0; height: 0;
    border-top: 20px solid transparent;
    border-right: none;
    border-bottom: 20px solid transparent;
    border-left: 20px solid #777;
}
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