.tracnghiem form {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-radius: 16px;
    background-color: white;
    box-shadow: rgb(149 157 165 / 20%) 0px 8px 24px;
    margin: 30px;
    padding: 12px;
    max-width: 300px;
    min-width: 250px
}

.tracnghiem .btn {
    padding: 10px 0;
    border: solid 1px #000;
    border-radius: 10px;
    transition: linear 0.1s;
}

.tracnghiem .btn:hover {
    border-color: #64d6f4;
    color: #64d6f4;
}

.tracnghiem h3 {
    text-align: center;
}