style.css

  * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        /* background:#455A64; */
      }
      body {
        width: 100vw;
        height: 100vh;
      }
      .header {
        height: 50px;
        width: 100%;
        text-align: center;
        font-size: 20px;
        padding: 10px;
        color: #fff;
        background: #7c4dff;
      }
      .header span {
        color: greenyellow;
      }
      .chats {
        width: 100%;
        margin-top: 5px;
        margin-bottom: 5px;
        display: flex;
        flex-direction: column;
      }
      .from {
        /* border: 2px solid black; */
        display: flex;
        justify-content: flex-start;
        margin-bottom: 5px;
      }
      .contentfrom {
        padding: 9px;
        border-radius: 20px;
        background: #f57c00;
        color: #fff;
        font-size: 18px;
      }
      .to {
        /* border: 2px solid black; */
        display: flex;
        justify-content: flex-end;
        margin-bottom: 5px;
      }
      .contentto {
        padding: 9px;
        border-radius: 20px;
        background: #448aff;
        color: #fff;
        font-size: 18px;
      }
      .sendbox {
        bottom: 0;
        position: absolute;
        margin-bottom: 50px;
        width: 100%;
        text-align: center;
      }
      .sendbox input {
        width: 80vw;
        height: 50px;
        font-size: 20px;
        padding: 5px;
      }
      .sendbox button {
        width: 90px;
        height: 50px;
        font-size: 20px;
        font-style: bold;
      }
      .chats{
        height: 80vh;
        overflow-y: scroll;
      }