* {
  box-sizing: border-box;
}
.menu {
  float: left;
  width: 12%;
  background-color: black;
  color: white;
}
.menuitem {
  padding: 8px;
  margin-top: 7px;
  border-bottom: 1px solid #f1f1f1;
}
.main {
  float: left;
  width: 73%;
  padding: 0 20px;
  overflow: hidden;
}

.right {
  background-color: lightblue;
  float: left;
  width: 15%;
  padding: 10px 15px;
  margin-top: 7px;
}
p{
    display: block;
    margin-block-start: 1em;
    margin-block-end: 1em;
    margin-inline-start: 0px;
    margin-inline-end: 0px;
}

@media only screen and (max-width:800px) {
  /* For tablets: */
  .main {
    width: 80%;
    padding: 0;
  }
   .main1 {
    width: 80%;
    padding: 0;
  }
  .right {
    width: 100%;
  }
}
@media only screen and (max-width:500px) {
  /* For mobile phones: */
  .menu, .main, .right {
    width: 100%;
  }
}