style.css

@import url('https://fonts.googleapis.com/css2?family=Silkscreen:wght@400;700&family=Workbench&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400..900&display=swap');

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html{
    height: 100%;
}
body{
    display: block;
    margin: 2em;
    font-family: "Open Sans", sans-serif;
    background-image: linear-gradient(to top, #cfd9df 0%, #e2ebf0 100%);
    overflow: hidden;
    margin: 20px auto;
}
.keypad {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.calc-body{
    margin: auto;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    width: 300px;
    height: 450px;
    padding: 5px;
    border-radius: 10px;
    background-color: hsl(210, 4%, 22%);
    box-shadow: 10px 8px 29px 0px hsl(0, 1%, 14%),
    inset 6px 4px 10px 0px hsla(0, 0%, 100%, 0.7);
}
.screen{
    display: flex;
    background-color: aliceblue;
    height: 50px;
    width: 90%;
    justify-content: flex-end;
    align-items: center;
    overflow: hidden;
}
.screen > p{
    position: relative;
    font-size: 2em;
    font-family:"Silkscreen", sans-serif;
    font-kerning: 1px;
}
.calc-btn {
    width: 2.5em;
    height: 2.5em;
    margin: 3px;
    font-size: 1.3em;
    color: white;
    cursor: pointer;
    font-weight: bold;
    font-family: "Orbitron";
    border-radius: 50%;
    justify-content: center;
    align-items: center;
    transition: all 100ms ease-in-out;
    box-shadow: inset 20px 10px 10px -19px #FFFFFF, 
    inset -16px -7px 15px 0px hsla(230, 76%, 27%, 0.4)
}
.calc-btn:hover{
    color: #cdcdcd;
}
.calc-btn:active{
    transform: scale(.9);
    box-shadow: inset 20px 10px 10px -19px hsla(230, 76%, 27%, 0.4), 
    inset -16px -7px 15px 0px hsla(230, 76%, 27%, 0.4)
}
#equals{
    height: 2em;
    width: 10em;
    margin: 10px;
    border-radius: 10px;
    font-size: 1.5em;
}
.icon{
    font-size: .8em;
}
button{
    border: 0;
    background-color: orangered;
}
.number{
    background-color: hsl(240, 50%, 15%);
}
.light-gray{
    background-color: #5b5c5f;
}
hr{
    margin: 20px auto 0px auto;
    width: 500px;
    border: 2px solid #5b5c5f;
    border-radius: 50%;
}
.history{
    display: flex;
    width: 500px;
    height: 500px;
    overflow: hidden;
    color: rgb(191, 85, 85);
    justify-content:flex-end;
    text-align: right;
    margin: 0 auto;
    font-family: "Orbitron", sans-serif;
    font-weight: 900;
    font-size: 2.5em;
}
li{
    list-style: none;
}