style.css

body {
    margin: 0px;
    padding: 0px;
    background: #F3F5FC;
}
.container {
    margin: auto;
    width: 960px;
    height: 680px;
    padding: 5px;
    /*background: blue;*/
}
.logo {
    float: left;
    width: 100%;
    /*background: red;*/
}
.left {
    float: left;
    width: 70%;
    height: 70%;
    border-radius: 24px;
    /*background:yellow;*/
}
.right {
    float: right;
    width: 30%;
    height: auto;
    border-radius: 24px;
    background:white
    /*background: orange;*/
}
.left-button {
    float: left;
    width: 70%;
    height: auto;
    padding-bottom: 1%;           /* add por conta*/
    border-radius: 24px;
    /*background: pink;*/
}
.logoimg {
    margin-top: 1%;
    margin-left: 5%;
    float: inherit;
}
.title {
    float: inherit;
    margin-left: 20%;
}
.text-input {
   float: left;
   margin-left: 10%;
   margin-top: 5%;
   width: 80%;
   height: 80%;
   color: #0A3871;
   font-size: 20px;
   
   border: none;
   outline: none;
   background: #F3F5FC;
}
#boneco {
    margin-left: 2%;
    margin-top: 20%;
    width: 90%;
    height: auto;
}
#texto {
    margin-left: 7%;
    margin-right: 5%;
}
#texto2 {
    float: left;
    margin-left: 10%;
    color:#0A3871;
    width: 80%;
    height: 60%;
    border: none;
    outline: none;
    font-size: 15px;
}
#btn-criptografar {
    padding: 24px;
    width: 30%;
    height: 60%;
    border-radius: 24px;
    margin-left:15%;
    background: #0A3871;
   

}
#btn-descriptografar {
    padding: 24px;
    width: 30%;
    height: 60%;
    border-radius: 24px;
    margin-left: 10%;
    background: #D8DFE8;
}
#copiar {
    margin-left: 30%;
    margin-top: 90%;
    padding: 24px;
    width: 40%;
    height: 10%;
    background: #D8DFE8;
    border-radius: 24px;
    display: none;
}