*{
    box-sizing: border-box;
}

body{
    background: black;
    color: white;
    margin: 0 auto;
}

@media (min-width: 500px){ body{ width: 90%; } }
@media (min-width: 600px){ body{ width: 80%; } }
@media (min-width: 700px){ body{ width: 70%; } }
@media (min-width: 800px){ body{ width: 60%; } }
@media (min-width: 900px){ body{ width: 50%; } }


.again, .secret, #guessNumber, .check{
    font-weight: bold;
    text-align: center;
}

.again{
    float: left;
    width: 80px;
    height: 30px;
}

.head p{
    text-align: end;
}

.head h1{
    text-align: center;
}

fieldset{
    border: 3px solid;
    border-left: 0;
    border-right: 0;
    border-bottom: 0;
}

.secret{
    width: 80px;
    height: 40px;
    background: white;
    color: black;
    font-size: 2rem;
}

.left{
    float: left;
}

#guessNumber{
    width: 120px;
    height: 60px;
    border-radius: 5px;
    color: white;
    background-color: black;
    border: solid gray;
    margin-bottom: 10px;
    margin-left: 20px;
    font-size: 2.5rem;
}

.check{
    margin-left: 45px;
    width: 70px;
    height: 30px;
    border-radius: 5px;
}

.right{
    margin-left: 300px;
}

.message{
    margin-top: 0;
    margin-bottom: 40px;
}

.score-high-score-message{
    margin: 0;
}

.head{
    margin-bottom: 1.5rem;
}