.rounded_checkbox {
    position: relative;
}

    .rounded_checkbox label {
        background-color: #fff;
        border: 1px solid #ccc;
        border-radius: 50%;
        cursor: pointer;
        height: 28px;
        left: 0;
        position: absolute;
        top: 0;
        width: 28px;
    }

        .rounded_checkbox label:after {
            border: 2px solid #fff;
            border-top: none;
            border-right: none;
            content: "";
            height: 6px;
            left: 7px;
            opacity: 0;
            position: absolute;
            top: 8px;
            transform: rotate(-45deg);
            width: 12px;
        }

    .rounded_checkbox input[type="checkbox"] {
        visibility: hidden;
    }

        .rounded_checkbox input[type="checkbox"]:checked + label {
            background-color: #66bb6a;
            border-color: #66bb6a;
        }

            .rounded_checkbox input[type="checkbox"]:checked + label:after {
                opacity: 1;
            }