popup.css

html,
body {
        font-family: "Open Sans", sans-serif;
        font-size: 14px;
        margin: 0;
        min-height: 180px;
        padding: 0;
        width: 450px;
      }


body::-webkit-scrollbar {
  display: none;
}


ul {
    list-style-type: none;
}

a {
  text-decoration: none;
}

/* header start*/

#header-btn {
  padding-bottom: 20px;
}

.btn {
  color: white;
  background-color: #000000;
  border-radius: 4px;
border: none;
      margin-right: 9px;
  line-height: 1.6;
  padding: .5em 2em;
  font: 1em "Trebuchet MS",sans-serif;
  float: left;
}
/* header end*/

#setuser_button {
  float: right;
}

  
 /* Questions section start  */
.container {
  padding: 20px;
}

/* #questions-block {
  display: none;
} */

#problems-header {
  text-align: center;
  font: 16px Arial, Helvetica, sans-serif;
}

 table {
  font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
  border-collapse: collapse;
  width: 94%;
  margin-left: auto;
  margin-right: auto;
  text-decoration: none;
}

td, th {
  border: 1px solid #ddd;
  padding: 12px;
  text-align: center;
}

tr:nth-child(even){
  background-color: #f2f2f2;
}

tr:hover {
  background-color: #ddd;
}

th {
  padding-top: 15px;
  padding-bottom: 15px;
  background-color: #000000;
  color: white;
}

.correct {
  background-color: #d6f6ca;
}

/* Questions section end  */