styles.css

body {margin:0; padding:0; overflow: hidden;}

h3 {
    margin-block-start: 0px;
}

#input-minutes, #paused-message {
    display: none;
    text-align: center;
    background: #000;
    color: #fff;
    opacity: .8;
    font-size: min(25vw, 25vh);
}

#fill {
    background: #c63; 
    position: fixed; 
    height: 100%; 
    width: 0%; 
    z-index: -1;
}

#config, #task-list {
    display: none;
    position: relative;
    z-index: 4;
    width: 100%;
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}

.block {
    padding:10px;
}

.task {
    border-bottom:1px #999 solid;
    float: left;
    width: 100%;
    padding-bottom: 4px;
    margin-bottom: 4px;
}

.task div {
    float: left;
    padding: 3px;
}

svg {
    width: 100%;
    height: auto;
}

.template {
    display: none;
}

.center {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  border: 0px solid green;
  overflow: hidden;
}

.button {
    padding: 10px 40px;
    font-size: 20px;
    background: #5A6;
    color: #fff;
    border-radius: 6px;
    display: inline-block;
    border: solid 1px #ccc;
}

#task-list .button {
    float: right;
    margin-right: 20px;
    padding: 3px 10px;
    border-radius: 8px;
    color: #fff;
    font-size: 12px;
}

.button.remove {
    background: #966;
}

.timer-value-container {
    font-size: min(35vw, 35vh);
}

#timer {
    position: relative;
    z-index: 1;
}

#timer-description {
    position: absolute;
    font-size: min(10vw, 10vh);
    top: 75%;
    text-align: center;
    width: 100%;
}