style.css

/* #mainBody::before{
    content: "";
    position: absolute;
    background: url('./img/marius-niveri-rfg4l6_lu3c-unsplash.jpg') no-repeat center center/cover;
    height: 100%;
    top: 0px;
    bottom: 0px;
    width: 100%;
    z-index: -1;
    opacity:0.89;
} */

#mainBody{
    background-color: #000000;
    background-image: linear-gradient(315deg, #000000 0%, #414141 74%);;
}

#floatingTextarea, #decoded, #encoded{
    border: 2px solid black;
    min-height: 15rem;
    overflow-y: scroll;
    overflow-x: auto;
    font-family: 'Noto Sans JP', 'sans-serif';
    font-size: 1.5rem;
    background-color: rgb(78, 76, 76);
    color: white;
}

table, th, td{
    /* border: 2px solid black; */
    border-radius: 20px;
    outline: none;
    text-align: center;
}

.tableStyle{
    color:black;
    font-size: 1.4rem;
    font-family: 'Ubuntu', sans-serif;
}

#btnContainer{
    display: flex;
    text-align: center;
    justify-content: center;
}

#compress{
    border: 2px solid white;
    background-color: black;
    color: white;
    font-size: 1.5rem;
    border-radius: 20px;
    padding: 10px;
}

#reset{
    background-color: white;
    color: black;
    border: 2px solid black;
    border-radius: 15px;
    font-size: 1.5rem;

}

label{
    font-size: 1.5rem;
    color: whitesmoke;
}

#sizeContainer{
    display: grid;
    grid-template-rows: 1fr;
    grid-template-columns: 1fr 1fr;
    grid-gap: 1rem;
    padding: 20px;
}

#before, #after{
    display: flex;
    justify-content: center;
    background-color: black;
    border: 4px solid white;
    height: auto;
    text-align: center;
    font-size: 2rem;
    font-family: 'Ubuntu', sans-serif;
    font-weight: bold;
    padding: 10px;
}

@media only screen and (max-width: 600px) {
    section{
        min-width: 800px;
    }

    header{
        min-width: 800px;
    }

  }