style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}
body{
    /* display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column; */
    background: #141313;
    color: #fff;
}

.container{
    width: 100%;
    /* height: 100vh; */
    padding: 0px;
    display: flex;
    /* flex-direction: row; */
    overflow: hidden;
}
/* responsive */ 
@media (max-width: 768px){
    .container{
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }
}

.left , .right {
    flex-basis: 50%;
    padding: 5px;
}

label{
    /* font-size: 20px; */
    color: #fff;
    display: flex;
    align-items: center;
    background-color: #000;
    height: 30px;
    padding: 10px 10px;
}

textarea{
    width: 100%;
    height: 28%;
    background: #1f1f1f;
    color: #fff;
    padding: 10px 20px;
    border:0;
    outline: 0;
    /* resize: none; */
    font-size: 18px;
}

textarea:focus{
    border-top: 2px solid #e74c3c;
}

iframe{
    width: 100%;
    height: 92.5%;
    border: 0;
    outline: 0;
    background: #fff;
}

.label-list{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 10px;
    background-color: #000;
    height: 30px;
}

.label-list .download{
    cursor: pointer;
}