0px;
        box-sizing: border-box;
        border: 50px solid transparent;
        background-clip: border-area;
        background-image: url(../resources/blue-100.png);
    }

    .rounded {
        border-radius: 40%;
    }

    .missing-border {
        border-right-style: hidden;
    }

    .double {
        border-style: double;
    }

    .inset {
        border-style: inset;
    }

    .complex {
        border-right-style: double;
        border-bottom-style: dashed;
        border-left-style: do