.box {
    max-width: 370px;
    border: 6px solid #303030;
    padding: 6px;
    margin: 0 auto;
    overflow: hidden;
}

div.address {
    width: 45%;
    float: left;
}

div.mask {
    width: 50%;
    float: right;
}

div.cidr {
    width: 45%;
    float: left;
}

div.information {
    width: 100%;
    float: left;
}

input[type], select {
    width: 18ch;
}


/*
datalist {
    width: auto;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding-left: 3px;
    flex-grow: 1;
    flex-shrink: 1;
    flex-basis: content;
}
*/

h2 {
    text-transform: uppercase;
}

label {
    text-transform: uppercase;
    vertical-align: sub;
    display: block;
    font-size: 0.7em;
    margin-top: 4px;
    margin-bottom: 2px;
}

input[type="range"] {
    margin: 0 auto;
    width: 20ch;
}

input:invalid {
    background-color: #d75f5f;
}