*{
    margin: 0;
    padding: 0;
   font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
h1{
    text-align: center;
    color: aliceblue;
    font-size: x-large;
}

body{
    background:linear-gradient(to left ,blue,black  , black  ,blue);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    flex-direction: column;
}

.box{
    display: flex;
    padding-top: 20px;
    padding-bottom: 10px;
    width: 20em;
    height: 22em;
    border: 2px solid rgb(6, 72, 253);
    align-items: center;
    flex-direction: column;
    border-radius: 10px;
}

.visor{
    border-radius: 5px;
    width: 275px;
    height: 40px;
    border: 3px solid  rgb(6, 72, 253);
    background-color: azure;
    text-align: end;
    font-size: 32px;
    vertical-align: top;
}
.expressao{
    color:rgb(50, 224, 255);
    overflow: hidden;
    height: 1.5em;
    width: 275px;
    text-align: center;
}
.box .botoes{
    
    display: flex;
    flex-direction: column;
    width: 19em;
    height: 19em;
    border-bottom: 2em;
}

.btn{
    width: 73px;
    height: 40px;
    border-radius: 10%;
    border:2px solid rgb(6, 72, 253);
    text-align: center;
    align-items: center;
    font-size: larger;
    font-weight: bolder;
    background-color: azure; 
} 
 
.btn-small{
    width: 40px;
    height: 40px;
    margin-left: 0 2px;
}
.btn-large{
    width: 82px;
    height: 40px;
    margin-left: 0 2px;
}

.btn-xlarge{
    width: 130px;
    height: 40px;
    margin-left: 0 2px;
    border-radius: 7px;
    text-align: center;
  
}
.btn-small:hover{
    background-color: rgb(168, 236, 236); 
    border:2px solid rgb(0, 225, 255);
    
}

.btn-red{
    background: rgb(241, 41, 41);
    color: whitesmoke;
    font-size: larger;
    font-weight: 900;
}
.btn-red:hover{
    background: rgb(95, 4, 4);
    color: whitesmoke;
    font-size: larger;
    font-weight: 900;
    border-color: rgb(255, 0, 0);
}
.btn-green{
    display: flex;
    background: rgb(80, 206, 69);
    color: whitesmoke;
    font-size: larger;
    font-weight: 900;
    font-size: 40px;
    align-self: center;
    justify-content: center;
    padding-bottom: 10px;
}
.btn-green:hover{
    display: flex;
    background: rgb(21, 255, 0);
    color: whitesmoke;
    font-weight: 900;
    font-size: 44px;
    align-self: center;
    justify-content: center;
    padding-bottom: 10px;
    border-color: gold;
}
.btn-yellow{
    display: flex;
    background: rgb(241, 238, 41);
    color: rgb(2, 2, 2);
    font-size: larger;
    font-weight: bolder;
    font-size: 30px;
    align-self: center;
    justify-content: center;
    padding-bottom: 3px;
}
.btn-yellow:hover{
    display: flex;
    background: rgb(158, 157, 95);
    color: rgb(253, 250, 250);
    font-size: larger;
    font-weight: bolder;
    font-size: 34px;
    padding-bottom: 3px;
    border-color: aqua;
}

.btn-line{
    margin-top: 0px;
    padding: auto;
    display: flex;
    justify-content: space-between;
    width: 16em;
    height: 40px;
    margin-top: auto;
    line-height: 50px;
    align-items: center;
    vertical-align: top;
    align-self: center;
}
.credits{
    margin-top: 2em;
    align-self: center;
    font-size: 1em;
    color: white;
    text-align: center;
    box-shadow: 0px 6px 0px rgba(255, 255, 255, 0.5);
  }