*{
    padding: 0;
    margin: 0;
    transition: .4s;
}

body{
    background-color: #334;
    margin: 0;
    padding: 0;
    font-family: 'Open sans', sans-serif;
    font-size: 1.3em;
    line-height: 1.5em;
    width: 100%;
    
}
.container{
    max-width: 640px;
    margin: 100px auto;
    padding: 20px;
    background-color: black;
    border-radius: 10px;
    text-align: center;
}
.container h1{
    color: aliceblue;
    margin-bottom: 5px;
}

.calculadora{
    width: 400px;
    margin: 0 auto;
}

.display{
    font-size: 2em;
    width: 100%;
    text-align: right;
    border-radius: 10px;
    
}
.display:focus{
    text-align: right;
}

.btn{
    width: 100%;
    height: 40px;
    font-size: 1.1em;
    background-color: #333;
    color: aliceblue;
    border: none;
    border-radius: 12px;
    cursor: pointer;
}
.btn:hover{
    /* background: rgb(209, 232, 252); */
    background-color: aliceblue;
    color: #333;
}
#orange{
    background-color: orange;
}
#orange:hover{
    background-color: aliceblue;
    transition: .4s;
    color: orange;
}

.resultados{
    margin: 0 auto;
    width: 300px;
    height: 200px;
    background: #333;
    text-align: center;
    border-radius: 20px;
}
#lista{
    width: 150px;
    text-align: center;
    margin-top: 6px;
    height: 145px;
    border-radius: 10px 0 0 10px;
}
.txtres{
    color: aliceblue;
    padding-top: 10px;
}

.footer{
   text-align: center;
   margin-top: 20px;
}