.input-group {
    clear: both;
    margin-top: 10px;
    display: inline-block;
}

    .input-group input {
        border: 1px solid #eeeeee;
        box-sizing: border-box;
        margin: 0;
        outline: none;
    }

        .input-group input[type="number"] {
            -moz-appearance: textfield;
            -webkit-appearance: none;
        }

        .input-group input[type='button'] {
            background-color: #fefefe;
            min-width: 35px;
            width: auto;
            cursor: pointer;
            border: 1px solid #eeeeee;
        }

    .input-group .button-minus,
    .input-group .button-plus {
        font-weight: bold;
        height: 35px;
        padding: 0;
    }

    .input-group .quantity-field {
        height: 35px;
        text-align: center;
        width: 45px;
        font-size: 13px;
    }

.button-plus {
    left: -13px;
}