html{
    overflow-y: hidden;
}

.correct {
    color: green;
}
html{
    overflow-y: hidden;
}

.incorrect {
    color: red;
}
.topic_style{
    border: 1px solid black;
    text-align: right;
    font-size: large;
}
.category_header{
    text-align: center;
    background-color: lightgrey;
}
#topic_selection{
    width: 20em;
    border-right: 2px solid;
    height: 100%;
    overflow-y: auto;
}
#help_div{
    display:none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    padding: 10%;
    background: rgba(153, 153, 153, 0.5);
}
#help_text_div{
    background-color: white;
    width: 100%;
    height: 100%;
    padding: 1%;
}
.help_button{
    position: absolute;
    top: 0;
    right: 0;
    margin: 1%;
}

/* removing arrows from number-input*\
/* Chrome, Safari, Edge, Opera */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
/*#next_button{
    border-bottom: 2vh solid black;
}


/* Firefox */
input[type=number] {
    -moz-appearance: textfield;
}
input[type="checkbox"]{
    margin: 0 1%;
}
#text_next_to_check_button_div{
    display: inline-block;
    padding: 3%;
}
.big_button{
    height: 5vh;
    width: 100%;
    margin-top: 1vh;
    font-size: larger;
    background-color: #efefef;
}
.big_button:active{
    background-color: #b8b8b8;
}
#next-button-footer{
    position: absolute;
    bottom: 0;
    right: 0;
    padding: 2%;
    width: 20em;
}
.table_input{
    width: 75px;
}
input[type="number"].table_input.correct{
    background-color: lightgreen;
    color: black;
}
input[type="number"].table_input.incorrect{
    background-color: lightcoral;
    color: black;
}
table, th, td {
    border: 1px solid black;
    border-collapse: collapse;
  }
html, body{
    width: 100%;
    height: 100%;
}
body{
    display: flex;
    margin: 0;
}
#exercise_container{
    width: 100%;
    overflow-x: auto;
    padding: 1%;
}
.question_form{
    display: none;
}