style.css

@import url("https://fonts.googleapis.com/css2?family=Roboto:wght@300&display=swap");

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Roboto", sans-serif;
  min-height: 450px;
}
#main {
  margin: auto;
  width: 100%;
}
nav {
    margin-top: -16px;
  width: 100%;
  height: 88px;
  background: #128c7e;
  position: fixed;
  z-index: 1;
}
nav > h1 {
  color: white;
  margin: 15px 10px;
}
ul.tools {
  float: right;
  display: block;
  margin-top: -40px;
}
nav > ul.fun {
  display: flex;
  width: 100%;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  padding-inline-start: 0px;
}
nav > ul.tools {
  display: flex;
}
nav > ul.fun > li {
  color: white;
  font-weight: bold;
  text-align: center;
  margin-top: 6px;
}
li.csc {
  width: 100%;
}
nav > ul > li > img {
  height: 22px;
  margin-right: 5px;
  margin: 0 8px 0 10px;
}
li {
  list-style: none;
}
/* The below code is for body of chats */
div#chats {
  width: 100%;
  height: auto;
  position: absolute;
  margin-top: 63px;
}
div.dp-name {
  display: flex;
}
ul.nperson {
  padding-inline-start: 15px;
}
img.dp {
    margin-right: 11px;
}
ul.nperson >li {
    /* border: 4px solid red; */
  }
  p.umsg {
      margin-left: 58px;
      margin-top: -21px;
  }
  h3.uname {
      margin-top: 7px;
      width: 100%;
  }
  p.time {
      display: block;
      float: right;
      margin-left: 0%;
      margin-right: 8px;
  }
  div img.dp {
      border-radius: 50%;
      width: 45px;
      height: 45px;
  }
div.message > img {
    height: 55px;
    float: right;
    margin-right: 10px;
    margin-top: 600px;
}