How to make content with buttons center

Dear Friends,

i want to make the content vertical and horizontal content in the below pic:

i want to make those blue buttons center and left and right arrows next to it in vertical & horizontal center all the content.

i used the below code:

.html

<ion-content>

  <div class="full-screen" >

    <div style="height: 10%;">

        <ion-row class="headrow">

            <ion-col text-left>

                <ion-icon src="../../assets/imgs/left_arrow.svg" style="vertical-align: -webkit-baseline-middle; height: 50px; width: 50px;" (click)="back_clicked()"></ion-icon>

              <img src="../../assets/imgs/nav_logo.png" height="40px" style="vertical-align: -webkit-baseline-middle">

              <ion-label style="padding:15px; font-size: 40px; color: #ffffff; vertical-align: -webkit-baseline-middle"><span>ProjectName</span> <span style="font-size: 10px;">v1.0.0</span> </ion-label>

            </ion-col>

            

            <ion-col text-right>

                <ion-icon src="../../assets/imgs/home.svg" style="vertical-align: -webkit-baseline-middle; height: 40px; width: 40px; padding-left: 5px; color: #808c9c" (click)="back_clicked()"></ion-icon>

              <img src="../../assets/imgs/prof_pic.png" height="40px" style="padding:2px; vertical-align: -webkit-baseline-middle">

            </ion-col>

          </ion-row>

          

    </div>

    <div class="centerrow">

      

          <ion-icon name="arrow-dropleft" style="height:40px"></ion-icon>

          <ion-grid >

            <ion-row>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

            </ion-row>

            <ion-row>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

            </ion-row>

            <ion-row>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

              <ion-button class="butStyle"></ion-button>

            </ion-row>

        </ion-grid>

        <ion-icon name="arrow-dropright" style=" font-size: larger; height:40px; color: blue;"></ion-icon>

      </div>

    

  </div>

</ion-content>

.scss file is:

.full-screen {

    height: 100% !important;

    width: 100% !important;

}

.headrow{

    height: 100%;

    padding-left: 20px;

    //padding-right: 55px;

    background: #2C405A;

    color: white;

}

.centerrow{

    text-align: center;

    align-content: center;

    display: flex;

    align-items: center;

    justify-content: center;

    height: 90%;

    flex-wrap: wrap;

    div{

        width: 60%;

    }

}

.butStyle{

    background-color: blue;

    width: 100px;

    height: 100px;

}

How can i make those content vertical and horizontal center with responsive? pls help me friends.

Thanks and Regards,
Syed Abdul Rahim