@import url('https://fonts.googleapis.com/css2?family=Open+Sans&display=swap');

*{
    font-family: 'Open Sans', sans-serif;
}
body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.bg{
    width: 100%;
    height: 100vh;
    background: -webkit-linear-gradient(red, orange, yellow);
    background: -moz-linear-gradient(red, orange, yellow);
    background: -o-linear-gradient(red, orange, yellow);
    background: linear-gradient(red, orange, yellow);
}
.container{
    width: 83.33%;
    margin: auto;
}
.main{
    background-color: #fff;
    position: fixed;
    top:50%;
    left: 50%;
}
.titles{
    line-height: 6px;
    padding: 15px 0 10px;
}
.note, .inputs, .buttons, .result{
    width:80%;
    margin: auto;
}
.btn{
    width: 100%;
    padding: 5px;
    border: none;
    font-weight: 600;
    color: #fff;
}
.form-control, .btn{
    margin-top: 5px;
    margin-bottom: 5px;
    border-radius: 10px;
}
#btnEnter, #btnClear{
    background-color: red;
}
#output{
    font-weight: 800;
}
@media only screen and (min-width: 767px){
    .main{
        width: 500px;
        height: 500px;
        margin-top: -250px;
        margin-left: -250px;
    }
    .titles .main-title{
        font-size: 60px;
    }
    .main-title, .subtitle,.note{
        text-align: center;
    }
    .note{
        font-size: 14px;
        line-height: 20px;
        padding-bottom: 5px;
    }
    .main{
        border-radius: 25px;
    }
    .form-control{
        width: 96.5%;
        padding: 10px 7.5px;
        border: 2px solid black;
    }
    .form-control, .btn{
        font-size: larger;
    }
    .result, #output{
        font-size: 24px;
    }
}
@media only screen and (max-width: 767px){
    .main{
        width: 350px;
        height: 350px;
        margin-top: -175px;
        margin-left: -175px;
    }
    .main-title, .subtitle,.note{
        text-align: center;
    }
    .note{
        font-size: 12px;
        line-height: 10px;
        padding-bottom: 2.5px;
    }
    .main{
        border-radius: 25px;
    }
    .form-control{
        width: 95%;
        padding: 5px 7.5px;
        border: 1px solid black;
    }
}