nitro-react/src/views/room/widgets/chat-input/ChatInputView.scss

@media only screen and (max-width: 600px) {
    .nitro-chat-input {
        position: fixed;
        left: 50%;
        transform: translateX(-50%);
        bottom: 65px !important;
    }
}

.nitro-chat-input {
    pointer-events: none;
    z-index: $chatinput-zindex;

    .chatinput-container {
        position: relative;
        height: 40px;
        border-radius: 8px;
        border: 2px solid rgb(0, 0, 0);
        background: #EDEDED;
        pointer-events: all;
        padding-right: 30px;
        width: 100%;

        .input-sizer {
            display: inline-grid;
            vertical-align: top;
            align-items: center;
            position: relative;
            height: 100%;
            padding: 0 10px;
            
            &::after,
            input,
            textarea {
              width: auto;
              min-width: 1em;
              grid-area: 1 / 2;
              margin: 0;
              resize: none;
              background: none;
              appearance: none;
              border: none;
            }
            
            &::after {
              content: attr(data-value) '  ';
              visibility: hidden;
              white-space: pre-wrap;
            }
          }

        .chat-input {
            height: 100%;
            font-size: 16px;
            outline: 0;
            border: 0;
            position: relative;
            background: transparent;
        }

        &:before {
            content: "";
            position: absolute;
            width: 98%;
            height: 5px;
            border-radius: 8px;
            top: 1px;
            left: 0;
            right: 0;
            margin: auto;
            background: rgb(255, 255, 255);
            z-index: 1;
        }
    }
}