* {
    box-sizing: border-box;
}

body {
    background-image: url(../img/wallpaper.jpg);
} 

.calc {
    width: 300px;
    height: 540px;
    
    border: 1px solid #000;
    border-radius: 35px;
    background-color: #000;
    color: #fff;

    font-family: Arial, sans-serif;

    padding: 18px;
    box-shadow: 4px 4px 4px #181717;

    margin: 10vh auto;

}

.calc-screen {
    height: 125px;
    padding: 10px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    overflow: hidden;
}

.calc-screen p {
    text-align: right;
    font-size: 4rem;
    margin: 0;
}

.txt-p::selection {
    background-color: #333;
}

.calc__row-1 {
    display: flex;
    column-gap: 9px;
    margin-bottom: 10px;
    justify-items: center;
}
.calc__row-2 {
    display: flex;
    column-gap: 9px;
    margin-bottom: 10px;
}
.calc__row-3 {
    display: flex;
    column-gap: 9px;
    margin-bottom: 10px;
}
.calc__row-4 {
    display: flex;
    column-gap: 9px;
    margin-bottom: 10px;
}
.calc__row-5 {
    display: flex;
    column-gap: 9px;
    margin-bottom: 10px;
}


.btn {
    width: 60px;
    height: 60px;
    background: #333;
    border-radius: 50%;
    text-align: center;
    line-height: 60px;
    font-size: 1.5rem;
    cursor: pointer;
    user-select: none;
    transition: 0.3s;

    
}

.zero {
    border-radius: 34px;
    width: 50%;
    text-align: left;
    padding-left: 24px;
}

.btn:hover {
    filter: brightness(120%);
    transition: 0.3s;
}

.btn:active {
    filter: brightness(95%);
}

.btn.bg-grey {
    background: #D4D4D2;
    color: #000;
}

.btn.bg-orange {
    background: #ffae00;
}

.equal {
    background: #ffae00;
    color: #fff;
}

.btn.bg-orange::active {
    background: #333;
    color: #ffae00;
    transition: 0.2s;
}

.bottombar {
    background: #fff;
    width: 38%;
    height: 3.5px;
    border-radius: 10px;
    margin: 0 auto;
    margin-top: 47px;
}