body {
    background-color: #b5b5b5;
}

.container{
    width: 400px;
    padding: 32px 2px;
    border-radius: 10px;
    margin: auto;
    margin-top: 64px;
    background-color: #424242;
    box-shadow: 0px 0px 12px 4px rgba(0,0,0,0.4);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.content{
    display: flex;
    flex-wrap: wrap;
    border-radius: 12px;
    margin: 12px;
    padding: 12px 0px;
    background-color: #b5b5b5;
}

.display {
    height: 96px;
    width: 90%;
    background-color:#808080;
    margin: 12px;
    font-size: 64px;
    display: flex;
    align-items:flex-end;
    justify-content: flex-end;
}

.btn-content {
    font-size: 32px;
    margin: 4px 8px 12px 12px;
    border: none;
    background-color: #d0ff00;
    color:#443627;
    border-radius: 24px;
    box-shadow: 5px 5px 0px 2px rgba(0,0,0,0.4);
    padding: 12px;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.opr sup {
    position:absolute;
    bottom: 2.1em;
    right: 0.8em;    
    font-size: 0.6em;
}

.opr:hover, .per:hover{
    background-color: #ff8c00 ;
    color: white;
}

.alt:hover, .del:hover{
    background-color: red;
    color: white;
}

.equals:hover{
    background-color:#0cd40c;
    color: white;
}

.num:hover {
    background-color: yellow;
}

a, p{
    color: white;
    text-decoration: none;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

a:hover {
    color: lightblue;
}