How to make placeholder in input scroll from left to right?

I want my the text in my input, to scroll from left to right, you'll find below my html and css a a picture of the code.

<div class="input-div">
    <ion-input [disabled]="chat_room_status === 'closed'" [placeholder]="chat_room_status === 'closed' ? 'Chat has ended. Cannot send new messages.' : 'Type your message here'" class="custom-input" type="text" [(ngModel)]="new_message"></ion-input>
    <ion-button [disabled]="new_message === '' || chat_room_status === 'closed'" (click)="sendMessage(room_id, new_message)">
      <ion-icon src="../../../assets/icon/send.svg"></ion-icon>
    </ion-button>
  </div>

.input-div
{
    display: flex;
    align-items: center;
    position: fixed; 
/* Keeps the input field at the bottom */
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: #3D4F57; 
/* Match the background to avoid gaps */
    padding: 10px;
}

.custom-input
{
    flex: 1; 
/* Ensures the input takes up remaining space */
    color: #fff;
    border: 2px solid #7FCBBF;
    border-radius: 20px;
    --padding-start: 10px;
    --highlight-color-valid: none;
    margin-right: 10px;
    --placeholder-color: #fff;
}



ion-button
{
    --background: #7FCBBF;
    --color: #fff;
    width: 50px;
    height: 50px;
    --border-radius: 50%;
}

https://preview.redd.it/jvfvn4yw1lde1.png?width=1060&format=png&auto=webp&s=73616d05c9330ab54d42db807805a45358586051