style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    background: #E9ECF8;
}

main {
    height: 100vh;
}

.entrada {
    vertical-align: top;
    display: inline-block;
    width: 65%;
    height: 100%;
   
}

.saida {
    display: inline-block;
    width: 30%;
    height: 100%;
    margin-left: 20px;
   
}

.logo {
    display: block;
    margin-top: 20px;
    margin-left: 40px;
}

#txtMensagem {
    display: block;
    width: 70%;
    height: 50%;
    margin: 20px 0 40px 100px;
    padding: 50px;
    border: none;
    resize: none;
 
}

#txtResultado {
    width: 80%;
    height: 90%;
    margin-top: 20px;
    margin-left: 30px;
    padding: 50px;
    border: none;
    resize: none;
    border-radius: 32px;
    background-color: white;
    box-shadow: 0px 24px 32px -8px rgba(0, 0, 0, 0.08);
    background-image: url(pessoa.png);
    background-repeat: no-repeat;
    background-position: center;
    background-size: 80%;
}

#criptografar, #descriptografar {
    display: inline-block;
    margin-top: 20px;
    width: 200px;
    height: 40px;
    border: none;
    border-radius: 15px;
}

#criptografar {
    background-color: #0A3871;
    color: white;
    margin-left: 150px;
}

#descriptografar {
    background-color: #D8DFE8;
    color: #0A3871;
    margin-left: 20px   ;
}

.div-btncopiar {
    display: none;
}

#btnCopiar {
    width: 100px;
    height: 30px;
    display: inline-block;
    margin-left: 100px;
    border: none;
    border-radius: 20px;
}

@media screen and (max-width: 1060px){
    .entrada{
        display: block;
    }

    #criptografar, #descriptografar{
        display: block;
        margin: 10px auto;
    }

    #txtResultado{
        min-width: 300px;
    }
}