.char-input {
    outline: none;
    text-align: center;
    border: none;
    border-bottom: solid 1px black;
    width: 50px;
    padding: 1px 2px;
}

@media (max-width: 1100px) {
    .char-input {
        width: 48px;
    }
}

@media (max-width: 1000px) {
    .char-input {
        width: 46px;
    }
}

@media (max-width: 900px) {
    .char-input {
        width: 44px;
    }
}

@media (max-width: 800px) {
    .char-input {
        width: 42px;
    }
}

@media (max-width: 700px) {
    .char-input {
        width: 37px;
    }
}

@media (max-width: 600px) {
    .char-input {
        width: 35px;
    }
}

@media (max-width: 500px) {
    .char-input {
        width: 33px;
    }
}

@media (max-width: 400px) {
    .char-input {
        width: 30px;
    }
}

@media (max-width: 300px) {
    .char-input {
        width: 28px;
    }
}