*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    outline: 0;
    transition: all 0.5s ease;
    }
    body{
    font-family: sans-serif;
    }
    a{
    text-decoration: none;
    color: #fff;
    }
    body{
    background-image: linear-gradient(to bottom right, #360033,#0b8793);
    }
    .container{
    height: 100vh;
    width: 100vw;
    display: grid;
    place-items: center;
    }
    .calculador{
    position: relative;
    height: auto;
    width: auto;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 30px #000;
    }
    .tema-alternador{
    position: absolute;
    top: 30px;
    right: 30px;
    color: #fff;
    cursor: pointer;
    z-index: 1;
    }
    .tema-alternador.active{
    color: #333;
    }
    .tema-alternador.active::before{
    background-color: #fff;
    }
    .tema-alternador::before{
    content: '';
    height: 30px;
    width: 30px;
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background-color: #333;
    z-index: -1;
    }
    #pantalla{
    margin: 0 10px;
    height: 150px;
    width: auto;
    max-width: 270px;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    font-size: 30px;
    margin-bottom: 20px;
    overflow-x: scroll;
    }
    #pantalla::-webkit-scrollbar{
    display: block;
    height: 3px;
    }
    button{
    height: 60px;
    width: 60px;
    border: 0;
    border-radius: 30px;
    margin: 5px;
    font-size: 20px;
    cursor: pointer;
    transition: all 200ms ease;
    }
    button:hover{
    transform: scale(1.1);
    box-shadow: rgba(16, 234, 1, 0.5) 0px 3px 8px;
    }
    button#equal{
    height: 130px;
    }
    /* light theme */
    .calculador{
    background-color: rgb(187, 187, 187);
    }
    .calculador #pantalla{
    color: #0a1e23;
    }
    .calculador button#limpiar{
    background-color: #ffd5d8;
    color: #fc4552;
    width: 130px;
    }
    .calculador button.btn-numbero{
    background-color: #c3eaff;
    color: #000;
    }
    .calculador button.btn-operador{
    background-color: #ffd0fd;
    color: #f967f3;
    }
    .calculador button.btn-igual{
    background-color: #adf9e7;
    color: #000;
    }
    /* dark theme */
    .calculador.oscuro{
    background-color: #071115;
    }
    .calculador.oscuro #pantalla{
    color: #f8fafd;
    }
    .calculador.oscuro button#limpiar{
    background-color: #2d191e;
    color: #bd3740;
    width: 130px;
    }
    .calculador.oscuro button.btn-numbero{
    background-color: #1b2f38;
    color: #f8fafb;
    }
    .calculador.oscuro button.btn-operador{
    background-color: #2e1f39;
    color: #aa00a4;
    }
    .calculador.oscuro button.btn-igual{
    background-color: #223323;
    }