*{
    margin:0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins',sans-serif;
}
body{
    background-color: #24272E;
}
header{
    display: flex;
    justify-content: center;
    padding: 20px;
    color:#24272E;
    background-color: white;
}
.container{
    color: antiquewhite;
    min-height:550px;
    width:350px;
    background-color: #212121;
    margin: 70px auto 0 auto;
    border-radius: 10px;
}
.output{
    /* min-height: 110px; */
    padding:10px;
    margin-bottom: 15px;
}
#history{
    overflow:auto;
    padding: 5px;
    margin:0 10px;
    font-size: 15px;
    min-height: 50px;
    text-align:right;
}
#current{
    overflow:auto;
    padding: 5x;
    margin: 0 10px;
    min-height: 50px;
    font-size: 45px;
    text-align: right; /*this worked better than float:right*/
}
.keyboard{
    border-radius: 10px;
    justify-content: center;
    padding:15px;
    background-color: #000000;
    display: grid;
    grid-template-columns: repeat(4,1fr);
    grid-template-rows: repeat(4,1fr);
    grid-gap: 10px;
}
.operator, .number, .other{
    color:white;
    background-color: black;
    width:70px;
    height: 70px;
    border-radius: 50vh;
    border-width: 0;
    font-size: 25px;
    cursor: pointer;
}
.operator:focus, .number:focus, .other:focus{ /*focus implies usuallt tapped/clicked*/
    outline: 0; /* when clicked it wont show that ugly default otline */
}
.operator{
    border: 2px solid crimson;
}
button:nth-child(20){ /**this selects nth element of the mentioned type*/
    background-color: crimson;
}
button:nth-child(20):hover{
    background-color: rgba(220,20,60,0.8);
}
button:hover{
    background-color: #24272E;
}
#message{
    color: antiquewhite;
    text-align: center;
    font-size: 13px;
    margin-top: 10px;
}