*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}

.game-board{
    width: 100%;
    height: 500px;
    border-bottom: 15px solid green;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    background: linear-gradient(#87CEEB, #E0F6FF);
}

.pipe{
    position: absolute;
    bottom: 0;
    width: 80px;
    animation: pipe-animation 1.5s infinite linear;
}

.mario{
    width: 150px;
    position: absolute;
    bottom: 0;
}

.jump{
    animation: jump 500ms ease-out;
}

.clouds{
    position: absolute;
    width: 550px;
    animation: clouds-animation 20s infinite linear;
}

.btnReiniciar{
    position: absolute;
    left: 45%;
    bottom: 10%;
    padding: 20px;
    padding-left: 40px;
    padding-right: 40px;
    font-size: 12pt;
    border: none;
    color: #fff;
    border-radius: 10px;
    background-color: red;
}
.btnReiniciar:hover{
    cursor: pointer;
}
.cronometro{
    position: absolute;
    right: 20px;
    display: flex;
    color: red;
    font-size: 16pt;
}
.cronometro p{
    margin-top: 20px;
}
.inicio{
    text-decoration: none;
    color: #000;
    position: absolute;
    top:10px;
    left: 10px;
    font-size: 30px;
}
@keyframes pipe-animation{
    from{
        right: -80px;
    }
    to{
        right: 100%;
    }
}

@keyframes jump{
    0%{
        bottom: 0;
    }
    40%{
        bottom: 200px;
    }
    50%{
        bottom: 200px;
    }
    60%{
        bottom: 200px;
    }
    100%{
        bottom: 0;
    }
}

@keyframes clouds-animation{
    from{
        right: -550px;
    }
    to{
        right: 100%;
    }
}