.cusBut {
    border-radius: 5px;
    line-height: 1.6;
    border: 2px solid #dddddd; 
    width: 75px;
    height: 30px;
    margin: 1rem; 
    float: right; 
    text-align: center; 
    color:white;
}
#start-timer {
    background-color: #91d68b;
} 
#stop-timer {
    background-color: #E70002;
    display:none;
} 
#alert { 
    display: none; 
    background-color: #6abdd7;
}