@media only screen and (max-width: 992px) {

    h1 {
        font-size: 30px;
        margin-top: 20px;
        margin-bottom: 30px;
        padding-bottom: 10px;
        letter-spacing: 5px;
    }

    .letter {
        width: 50px;
        height: 50px;
        padding-top: 5px;
    }

    .clear-btn,
    .space-btn,
    .bs-btn {
        font-size: 30px;
        padding-top: 5px;
        height: 50px;
        margin-bottom: 30px;
    }

    .translation-title {
        font-size: 20px;
    }

    #translation-list,
    #translation-text {
        font-size: 30px;
        min-height: 50px;
        margin-bottom: 30px;
    }
}

@media only screen and (max-width: 767px) {
    .container {
        max-width: 600px;
    }

    h1 {
        font-size: 20px;
        margin-bottom: 15px;
    }

    .letter {
        font-size: 20px;
        width: 30px;
        height: 30px;
        margin: 3px;
        padding-top: 0;
        border-radius: 5px;
    }

    .clear-btn,
    .space-btn,
    .bs-btn {
        font-size: 20px;
        padding-top: 0;
        height: 30px;
        margin-bottom: 20px;
        border-radius: 5px;
    }

    .translation-title {
        font-size: 17px;
    }

    #translation-list,
    #translation-text {
        font-size: 20px;
        min-height: 40px;
        margin-bottom: 20px;
    }

}