styles.css

.demo-ribbon {
    width: 100%;
    height: 40vh;
    background-color: #3F51B5;
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
}

.demo-main {
    margin-top: -35vh;
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
}

.demo-content {
    border-radius: 2px;
    padding: 80px 56px;
    margin-bottom: 80px;
}

.mdl-textfield {
    width: 92%;
}

.mdl-textfield__input {
    font-size: 30px;
}

.mdl-textfield__label {
    font-size: 30px;
    line-height: 45px;
}

.stopwatches input {
    width: 100%;
    display: none;
}

.stopwatches input + label:before {
    content: '⬜️';
    margin-right: 10px;
}

.stopwatches input:checked + label:before {
    content: '🌮';
}

.time.mdl-button {
    font-size: 30px;
    margin-left: 45px;
}

.stopwatch-name {
    text-align: center;
    overflow-wrap: break-word;
    border: none;
    resize: none;
    outline: none;
    overflow: visible;
    font-family: "Helvetica","Arial",sans-serif;
    font-size: 25px;
}

.stopwatch-option {
    margin-left: 20px;
    margin-right: 0px;
}