style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;

}
body{
    width: 100%;
    height: 100vh;
    color: #fff;

}
.container{
    background: #28c;
    text-align: center;
}
.container h1{
    font-weight: 600;
    padding: 1rem;
}
.editor{
    background: #252744;
    text-align: start;
    display: flex;
    padding: 1rem;
}
.left,.right{
    flex-basis: 50%;
    padding: 10px;

}
label{
    display: flex;
    align-items: center;
    font-size: 18px;

}
label i{
    padding: 5px;
}
textarea{
    width: 100%;
    height: 300px;
    background: #1f1f1f;
    color: #fff;
    border: 0;
    outline: 0;
    font-size: 18px;
    padding: 10px 20px;
}
iframe{
    width: 100%;
    height: 95%;
    background: #fff;
    border: 0;
    outline: 0;
}