* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-size: 16px;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    height: 100vh;
    color: #fff;
    background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

form {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.container {
    display: block;
    position: relative;
    padding-left: 35px;
    margin-bottom: 12px;
    cursor: pointer;
    font-size: 22px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Hide the browser's default radio button */
.container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

/* Create a custom radio button */
.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 25px;
    width: 25px;
    background-color: #eee;
    border-radius: 50%;
}

/* On mouse-over, add a grey background color */
.container:hover input ~ .checkmark {
    background-color: #ccc;
}

/* When the radio button is checked, add a blue background */
.container input:checked ~ .checkmark {
    background-color: #2196f3;
}

/* Create the indicator (the dot/circle - hidden when not checked) */
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

/* Show the indicator (dot/circle) when checked */
.container input:checked ~ .checkmark:after {
    display: block;
}

/* Style the indicator (dot/circle) */
.container .checkmark:after {
    top: 9px;
    left: 9px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: white;
}

.square {
    border: 3px solid #ccc;
    padding: 20px;
    border-radius: 5px;
    width: 1000px;
}

.quest {
    padding: 20px 0;
    font-size: 25px;
}

.btn {
    width: 100%;
    margin-top: 20px;
}

.submit {
    padding: 8px 16px;
    margin-right: 5px;
    font-size: 20px;
    color: #fff;
    border-radius: 5px;
    border: none;
    outline: none;
    cursor: pointer;
}

.red {
    background-color: #bd5959;
}

.cyan {
    background-color: #229dcd;
}

.not {
    background-color: #df138a;
}

.submit:hover {
    opacity: 0.8;
}

.check {
    color: #ff9500;
    font-size: 20px;
    font-weight: bold;
}

.hide {
    display: none;
}

.next-prev {
    margin-bottom: 5px;
}

button {
    margin: 5px 0;
}

.image {
    margin: 20px 0;
    width: 100%;
}

@media only screen and (max-width: 1000px) {
    body {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .square {
        width: 95%;
    }
}

.a {
    background-color: #4534db;
}

button a {
    font-size: 18px;
    text-decoration: none;
    color: #fff;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 3px solid #ccc;
}

.aaaa {
    color: #ff9500;
    margin-right: 40px;
}

.bbb {
    background-color: #22a699;
}

#choncau {
    font-size: 20px;
    width: 150px;
    padding: 6px;
    border: none;
    outline: none;
    border-radius: 4px;
}