body {background-color: aliceblue;}

div {
    margin: 20px;
}
.box {
    margin: auto;
    width: 80%;
    max-width: 1000px;
    background-color: rgb(255, 255, 255);
}
.card {
    width: auto;
    padding: 10px;
}
.formula {
    margin: 0;
    display: inline-block;
}


p {
    background-color: rgb(255, 230, 230);
}

footer {
    margin-left: 20px;
    margin-right: 20px;
}
hr .hr-twill {
    border: 0;
    padding: 3px;
    background: repeating-linear-gradient(135deg, #a2a9b6 0px, #a2a9b6 1px, transparent 1px, transparent 6px);
}

.hr-edge-weak {
    border: 0;
    padding-top: 1px;
    background: linear-gradient(to right, transparent, #d0d0d5, transparent);
}


@media screen and (min-width: 451px) {
    a{
      font-size: 18px;
       padding:8px 12px 8px 12px;
    }
    p{
      font-size: 18px;
       padding:0px 0px 0px 12px;
    }
    div{
      font-size: 18px;
    }
    .formula {
        font-size: 18px;
    }
    form{
      font-size: 18px;
       padding:0px 0px 0px 8px;
    }
    input[type=text], select {
        width: 40%;
        max-width: 180px;
        padding: 4px 4px;
        margin: 4px 0;
        display: inline-block;
        border: 1px solid #ccc;
        border-radius: 4px;
        box-sizing: border-box;
    }
}

@media screen and (max-width: 450px) {
    a{
      font-size: 12px;
       padding:5px 8px 5px 8px;
    }
    p{
      font-size: 12px;
       padding:0px 0px 0px 8px;
    }
    div{
      font-size: 12px;
    }
    .formula {
        font-size: 8px;
    }
    form{
      font-size: 12px;
       padding:0px 0px 0px 8px;
    }
    input[type=text], select {
        width: 60%;
        max-width: 180px;
        padding: 4px 4px;
        margin: 4px 0;
        display: inline-block;
        border: 1px solid #ccc;
        border-radius: 4px;
        box-sizing: border-box;
    }
}