header {
    height: 120px;
    text-align: center;
    line-height: 120px;
}

main {
    max-width: 1200px;
    margin: auto;
    display: flex;
    gap: 10px;
}

canvas {
    width: calc(100% - 210px);
    aspect-ratio: 1.414 / 1;
    border-radius: 3px;
    box-shadow: 0 0 3px gray;
}

.adjuster_label {
    display: inline-block;
    margin-left: auto;
    text-align: right;
}

.slider-input {
    text-align: center;
    border-radius: 5px;
    width: 40px;
    height: 20px;
    border: 0px;
    padding: 0px;
    background-color: lightgray;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.panel {
    width: 200px;
    display: flex;
    gap: 10px;
    flex-flow: column;
}

.date-panel {
    display: flex;
    gap: 10px;
    flex-wrap: nowrap;
}

.adjuster-panel {
    flex: 1;
    display: flex;
    flex-flow: column;
    gap: 5px 0;
    padding: 20px;
    border-radius: 5px;
}

.adjuster {
    display: flex;
    gap: 10px;
}

#month_selector {
    flex: 1;
    font-size: 20px;
}

#year_selector {
    width: 50px;
    font-size: 20px;
}

#download_button {
    font-size: 32px;
    width: auto;
    line-height: 60px;
    text-align: center;
    text-decoration: none;
    border-radius: 9px;
    user-select: none;
    background-color: #5589E2;
    color: white;
}

.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: lightgray;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 20px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background: rgba(0, 0, 0, 0);
}

input:checked+.slider:before {
    -webkit-transform: translateX(20px);
    -ms-transform: translateX(20px);
    transform: translateX(20px);
}

.rainbow_background {
    width: 40px;
    height: 20px;
    margin-left: -50px;
    border-radius: 20px;
    background: linear-gradient(90deg, rgba(255,0,0,1) 0%, rgba(255,154,0,1) 10%, rgba(208,222,33,1) 20%, rgba(79,220,74,1) 30%, rgba(63,218,216,1) 40%, rgba(47,201,226,1) 50%, rgba(28,127,238,1) 60%, rgba(95,21,242,1) 70%, rgba(186,12,248,1) 80%, rgba(251,7,217,1) 90%, rgba(255,0,0,1) 100%);
}