for_client/src/styles/tasks/message.scss

.hc-layout-box {
    position: relative;
    height: 100%;
    display: flex;
    .hc-layout-left-box {
        width: 260px;
        position: relative;
        background: #f1f5f8;
        border-radius: 10px;
        box-shadow: -2px 0 10px 0 rgba(32,37,50,0.03), 0 10px 21px 20px rgba(32,37,50,0.03);
    }
    .hc-layout-content-box {
        flex: 1;
        display: inline-grid;
        position: relative;
        margin-left: 24px;
    }
}