body {
    margin: 0px;
    border: 0px;
    padding: 0px;
    height: 100%;
    font-family: 'Roboto', sans-serif;
    color: #000000;
    size: 16px;
    
}

/*screen smaller than 510px*/
@media screen and (max-width: 510px) {
    
    .header-container img {
        display: none;
    }
}

/*screen smaller than 376px*/
@media screen and (max-width: 400px) {
    
    .header-container h1 {
        font-size: 26px;
    }
}

.header-container {
    height: 150px;
    background-color: #000000;

    display: flex;
    flex-direction: row;
}

.header-container h1 {
    color: #FFFFFF;
    font-weight: 100;
    size: 42px;
    display: flex;
    align-self: center; /*vertical alignment*/
    margin: auto;
}

.image {
    width: 150px;
    height: 150px;
}

.container {
    display: flex;
    flex-direction: column; /*main axis is vertical*/
    margin: auto;
    justify-content: center; /*align itmes vertically for vertical main axis*/
    align-items: center; /*align items horizontally for vertial main axis*/
}

.counter-container {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-wrap: wrap;
    margin: 40px auto 0px auto;
}

.questions-container {
    border: 2px solid #6482FB;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    margin: auto;
    padding: 15px;
    margin: 20px;
}

.landing-question {
    font-weight: bold;
    font-size: 32px;
    display: flex;
    align-self: center;
    padding-top: 40px;
}

.btn {
    background-color: #6482FB;
    border: none;
    border-radius: 5px;

    padding: 20px;
    text-align: center;
    text-decoration: none;
    
    display: flex;
    margin-left: auto;
    margin-right: auto;
    

    font-family: 'Roboto', sans-serif;
    color: #ffffff;
    font-size: 24px;
}

.start {
    margin-top: 150px;
}

.hidden {
    display: none;
}

.option {
    margin: 30px 0px 15px 0px;
}

input {
    margin: 5px;
}

.check {
    margin-top: 35px;
}

.answer {
    margin-top: 100px;
    margin-left: 25px;
    font-size: 22px;
}

.next {
    margin-top: 90px;
}

.restart {
    margin-top: 55px;
}

input, label, button {
    cursor: pointer;
}