* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-color: rgb(0, 100, 166);
    max-width: 100%;
    overflow-x: hidden;
}

.unselectable {
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.btn-extra-large {
    width: 300px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-stopstart {
    padding: 70px;
    width: 100px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (min-width: 768px) {
    .btn-stopstart {
        width: 400px;
    }
}

.btn-estop {
    width: 390px;
    height: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.flash-button {
    animation: flashAnimation 1s infinite;
}

@keyframes flashAnimation {
    0%, 100% {
        background-color: red;
    }
    50% {
        background-color: darkred;
    }
}