h1{
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}
.container{
    max-width: 50%;
    margin: 0 auto;
}
.progress-bar{
    width: 100%;
    height: 20px;
    background-color: #ddd;
    border-radius: 10px;
}
.progress{
    width: 0%;
    height: 100%;
    background-color: #4caf50;
    border-radius: 10px;
    transition: width 1s ease-in-out;
}
.counter{
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    transition: 3s ;
}
#controls{
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}
button{
    padding: .4rem 1rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 5px;
    background-color: #4caf50;
    border: 2px solid #4caf50;
    color: #fff;
    cursor: pointer;
    transition: .4s;
}
button i{
    margin-left: 0.2rem;
    margin-right: 0.2rem;
}
.previus-btn{
    background-color: transparent;
    color: #4caf50;
}
button:hover{
    background-color: #2e8b57;
    color: #fff ;
}