html {
    font-family: 'Mukta', sans-serif;
    background-image: linear-gradient(45deg, #14a330 25%, #30ab48 25%, #30ab48 50%, #14a330 50%, #14a330 75%, #30ab48 75%, #30ab48 100%);
    background-size: 14.14px 14.14px;
    font-size: 150%;
}

#login {
    display: inline-block;
    margin: 0px auto;
    background-color: white;
    text-align: center;
    padding: 0.5em;
}

#login input {
    font-size: 1.2em;
}

#login button {
    font-size: 1.2em;
}

html, body {
    text-align: center;
}

#wrapper {
    opacity: 1.0 !important;
}

#feedback {
    font-weight: 500;
    font-size: .8;
    background-color: rgba(144, 238, 144, 0.253);
    white-space: pre;
}

.invisible {
    visibility: hidden !important;
}

h2 {
    margin: 0px;
    padding: 0px;
}

#practice {
    display: inline-block;
    margin: 0px auto;
    background-color: white;
    text-align: center;
    padding: 0.5em;
    padding-bottom: 2em;
}

.hidden {
    display: none !important;
}

#practiceTable {
    display: inline-block;
    margin: 0px auto;
    font-size: 1.5em;
}

td {
    padding: 0px;
}

#practice input[type="text"] {
    text-align: center;
    max-width: 5em;
    font-size: 1.2em;
}

#practice input[type="text"]:disabled {
    background-color: lightgray;
}

#invOpLhs {
    border: 1px solid gray;
    background-color: plum;
    text-align: center;
    /* max-width: 5em; */
}

#invOpRhs {
    border: 1px solid gray;
    background-color: lightyellow;
    text-align: center;
    /* max-width: 5em; */
}

#answer {
    border: 1px solid gray;
    background-color: lightblue;
    text-align: center;
    /* max-width: 5em; */
}

#practice button {
    font-size: 0.8em;
}

.op {
    font-weight: bold;
    font-size: 1.2em;
    background-color: lightgreen;
    padding-left: 0.3em;
    padding-right: 0.3em;
}

#score {
    font-weight: bold;
    margin-top: 1em;
}

.correction {
    color: purple;
    font-weight: bold;
    font-style: italic;
}