style.css

/*specification for all*/
* {
    font-family: 'Roboto', sans-serif;
    box-sizing: border-box;
}
/*-------------------------*/

/*bootstrap color adjusting*/
.btn-primary {
    background-color: #1E90FF !important;
    border-color: #006BFF !important;
    color: #1D1D1D !important;
    font-weight: bold;
}
.btn-primary:hover {background-color: #006BFF !important;}
.bg-primary {background-color: #1E90FF !important;}
.border-primary {border-color: #1E90FF !important;}
.text-primary {color: #1E90FF !important;}
.bg-dark {background-color: #1D1D1D !important;}
.text-dark {color: #1D1D1D !important;}
.btn-dark {color: #1D1D1D !important;}
.bg-light {background-color: #FFFFFF !important;}
.text-light {color: #FFFFFF !important;}
.border-light {border-color: #FFFFFF !important;}
.border-danger {border-color: #FF0000 !important;}
.text-danger {color: #FF0000 !important;}
a {color: #1E90FF !important;}
a:hover {color: #006BFF !important;}
button > i {color: #FFFFFF !important;}
/*-------------------------*/

/*some specification*/
h1, h2, h3, h4, h5, h6 {font-family: 'Roboto Slab', serif;}
.calculation-panel-x, .calculation-panel-y, .calculation-panel-x-y, .calculation-panel-x-and-y {display: none;}
/*-------------------------*/