body
{
    margin: 0;
    font-family: sans-serif;
    background: #ececec;
    text-align: center;
    padding: 2em;
    color: #fff;
}
.title
{
    font-size: 3em;
    margin-bottom: 2em;
    color: #222;
}
.units
{
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5em;
    flex-wrap: wrap;
}
.panel
{
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    min-width: 15em;
    height: 13em;
    position: relative;
}
.panel:nth-child(1)
{
    background: #ff4040;
}
.panel:nth-child(2)
{
    background: #4070ff;
}
.panel:nth-child(3)
{
    background: #62ff24;
}
.bg-unit
{
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    font-size: 10em;
    z-index: 0;
    pointer-events: none;
}
.panel:nth-child(1) .bg-unit
{
    color: #ff4b4b;
}
.panel:nth-child(2) .bg-unit
{
    color: #537eff;
}
.panel:nth-child(3) .bg-unit
{
    color: #7ffc4e;
}
.panel h2, .panel input
{
    position: relative;
}
.panel h2
{
    text-align: left;
    padding-left: 1em;
}
/*Remove default arrows from the input field*/
.panel input::-webkit-outer-spin-button,
.panel input::-webkit-inner-spin-button
{
    -webkit-appearance: none;
    margin: 0;
}
.panel input
{
    border: none;
    background: none;
    margin-top: 0.5em;
    width: 4em;
    height: 2em;
    font-size: 3em;
    font-weight: 600;
    text-align: center;
    color: #fff;
}
.panel input:focus
{
    outline: none;

}