html

    <checkbox color="#FFFFFF" />

微信小程序css

    >>>checkbox .wx-checkbox-input {
        border-radius: 50% !important;
        border: 2rpx solid #828181 !important;
    }

    >>>checkbox .wx-checkbox-input.wx-checkbox-input-checked {
        border: 2rpx solid #0c3ca8 !important;
        background-color: #0c3ca8 !important;
        color: #FFFFFF !important;
    }

    >>>checkbox .wx-checkbox-input.wx-checkbox-input-checked::before {
        color: #FFFFFF !important;
    }

H5 css

    >>>uni-checkbox .uni-checkbox-input {
        margin-right: 0;
        border-radius: 50%;
        border: 2rpx solid #828181;
    }

    /* 取消選中后的樣式 */
    >>>uni-checkbox .uni-checkbox-input:empty {
        border: 2rpx solid #828181;
        background-color: #5FFFFFF;
        opacity: 0.5;
    }

    /* 選中時的樣式 */
    >>>uni-checkbox .uni-checkbox-input:not(:empty) {
        border: 2rpx solid #0c3ca8;
        background-color: #0c3ca8;
        color: #FFFFFF;
    }