:root[data-theme= "dark"]{
    --main-bg: hsl(222, 26%, 31%);
    --toggle-bg: hsl(223, 31%, 20%);
    --keypad-bg: var(--toggle-bg);
    --screen-bg: hsl(224, 36%, 15%);
    --key-bg: hsl(30, 25%, 89%);
    --key-sh: hsl(28, 16%, 65%);
    --erase-bg: hsl(225, 21%, 49%);
    --erase-sh: hsl(224, 28%, 35%);
    --equal-bg: var(--toggleKey-bg);
    --equal-sh: hsl(6, 70%, 34%);
    --toggleKey-bg: hsl(6, 63%, 50%);
    --calc-bg: var(--main-bg);
    --main-text-color: hsl(0, 0%, 100%);
    --btn-text-color: hsl(221, 14%, 31%);
    --erase-color: var(--main-text-color);
    --equal-color: var(--main-text-color);
}
:root[data-theme = "light"] {
    --main-bg: hsl(0, 0%, 90%);
    --toggle-bg: hsl(0, 5%, 81%);
    --keypad-bg: var(--toggle-bg);
    --screen-bg: hsl(0, 0%, 93%);
    --key-bg: hsl(45, 7%, 89%);
    --key-sh: hsl(35, 11%, 61%);
    --erase-bg: hsl(185, 42%, 37%);
    --erase-sh: hsl(185, 58%, 25%);
    --equal-bg: var(--toggleKey-bg);
    --equal-sh: hsl(6, 70%, 34%);
    --toggleKey-bg: hsl(25, 98%, 40%);
    --calc-bg: var(--main-bg);
    --main-text-color: hsl(60, 10%, 19%);
    --btn-text-color: var(--main-text-color);
    --erase-color: hsl(0, 0%, 100%);
    --equal-color: var(--erase-color);
}
:root[data-theme="love"] {
    --main-bg: hsl(268, 75%, 9%);
    --toggle-bg: hsl(268, 71%, 12%);
    --keypad-bg: var(--toggle-bg);
    --screen-bg: hsl(268, 71%, 12%);
    /* key bg */
    --key-bg: hsl(268, 48%, 21%);
    --key-sh: hsl(290, 70%, 36%);
    --erase-bg: hsl(281, 89%, 26%);
    --erase-sh: hsl(285, 91%, 52%);
    --equal-bg: var(--toggleKey-bg);
    --equal-sh: #6cf9f2;
    --toggleKey-bg: #00e0d1;
    --calc-bg: var(--main-bg);
    --main-text-color: hsl(52, 100%, 62%);
    --btn-text-color: var(--main-text-color);
    --erase-color: #ffffff;
    --equal-color: hsl(198, 19%, 13%)
}

*, *::after, *::before{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body{
    background-color: var(--main-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    font-family: 'League Spartan', sans-serif;
    user-select: none; /* prevents text selection when user double clicks the buttons */
}
.container{
    width: 300px;
    border-radius: .4rem;
    padding: 0.4rem;
}
.header{
    width: 90%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--main-text-color);
}
 /* style range input for the theme selector */
 .themeSelector{
    display: flex;
    position: relative;
    text-transform: uppercase;
    justify-content: space-between;
    align-items: center;
    height: 2rem;
    width: 5rem;
    font-size: .6rem;
 }
label{
    display: flex;
    justify-content: space-between;
    position: absolute;
    width: 2rem;
    right: 5px;
    top: 0;
}
input[type="range"] {
    width: 2.5rem;
    height: 1rem;
    margin: 0;
    -webkit-appearance: none;
    appearance: none;
    background-color: var(--toggle-bg);
    border-radius: .5rem;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
    height: 0.9rem;
    border-radius: .5rem;
    background-color: transparent;
    padding: 2.5px;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; /* Override default look */
    appearance: none;
   
    background-color: var(--toggleKey-bg);
    height: 0.6rem;
    width: 0.6rem;
    border-radius: 50%;
}
.screen{
    width: 90%;
    height: 4rem;
    background-color: var(--screen-bg);
    margin: .7rem auto;
    border-radius: .5rem;
    color: var(--main-text-color);
    padding: 1rem;
    text-align: right;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.display{
    height: 1rem;
    font-size: 1.8rem;
    color: var(--main-text-color);
    word-wrap: break-word;

}
.display2{
    font-size: 0.8rem;
    color: var(--main-text-color);
}

.buttons{
    width: 90%;
    display: grid;
    text-transform: uppercase;
    grid-template-columns: repeat(4, 1fr);
    gap: .7rem;
    margin: .5rem auto;
    background-color: var(--keypad-bg);
    text-align: center;
    padding: 1rem;
    border-radius: .4rem;
}
.calc-btn{
    background-color: var(--key-bg);
    padding: .5rem;
    border-radius: .2rem;
    box-shadow: 0px 1px 1px 0px var(--key-sh);
    cursor: pointer;
    transition: all 0.2s;
    color: var(--btn-text-color);
}
.calc-btn:active{
    transform: translateY(2px);
}
.reset{
    grid-column:1/3;
}
.equal{
    grid-column: 3/5;
    color: var(--equal-color);
    background-color: var(--equal-bg);
    box-shadow: 0px 1px 1px 1px var(--equal-sh);
}
.equal:hover{
    background-color: hsl(25, 99%, 27%);
}
.erase{
    color: var(--erase-color);
    background-color: var(--erase-bg);
    box-shadow: 0px 1px 1px 1px var(--erase-sh);
    font-size: 0.8rem;
}
.attribution {
    font-size: 13px;
    text-align: center;
    position: absolute;
    bottom: 0;
}
.attribution a {
    color: var(--main-text-color);
}

/* Theme2 */