body {
    background: url("../assets/images/back-tools-3.jpg");
}
*{
    margin: 0;
    margin-top: 3%;
}
.row{
    width:514px;
    height: 40px;
    margin-left: auto;
    margin-right: auto;
}
.cont {
    margin-top: 3%
}
.inputcalc {
    font-family: Montserrat;
    font-size: 30px;
    background-color: white;
    border: none;
    color: black;
}
span{
        width: 10%; 
        font-size: 28px;
        line-height: 37px;
        border-right: 1px solid var(--var-body-fc);
        border-top: 1px solid var(--var-body-fc);
        color: black;
        font-family: Montserrat;
        cursor: pointer;
        text-align: center;
        display: inline-block;
        color: black;
        background-color: silver;
    }